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Private investigator



 
 
A private investigator or private detective (often shortened to PI or private eye) is a person who can be hired by individuals or groups to undertake investigations. Private investigators often work for attorney
Lawyer

A lawyer, according to Black's Law Dictionary, is "a person learned in the law; as an Attorney at law, counsel or solicitor; a person licensed to practice fraud." Law is the system of rules of conduct established by the sovereign government of a society to correct wrongs, maintain stability, and deliver justice....
s in civil cases. Many work for insurance companies to investigate suspicious claims. Before the advent of no-fault divorce
Divorce

Divorce or dissolution of marriage is a legal process in which a judge or other authority dissolves the bonds of matrimony existing between two persons, thus restoring them to the marital status of being single....
, many private investigators were hired to search out evidence of adultery
Adultery

Adultery is the voluntary sexual intercourse between a marriage and another person who is not his or her spouse, though in many places it is only considered adultery when a married woman has sexual relations with someone who is not her husband and in others it is only considered adultery when a married woman has sexual relations with someon...
 or other illegal conduct within marriage
Marriage

Marriage is a social, spirituality, or law union of individuals. This union may also be called matrimony, while the ceremony that marks its beginning is usually called a wedding and the married status created is sometimes called wedlock....
 to establish grounds for a divorce.






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Encyclopedia


A private investigator or private detective (often shortened to PI or private eye) is a person who can be hired by individuals or groups to undertake investigations. Private investigators often work for attorney
Lawyer

A lawyer, according to Black's Law Dictionary, is "a person learned in the law; as an Attorney at law, counsel or solicitor; a person licensed to practice fraud." Law is the system of rules of conduct established by the sovereign government of a society to correct wrongs, maintain stability, and deliver justice....
s in civil cases. Many work for insurance companies to investigate suspicious claims. Before the advent of no-fault divorce
Divorce

Divorce or dissolution of marriage is a legal process in which a judge or other authority dissolves the bonds of matrimony existing between two persons, thus restoring them to the marital status of being single....
, many private investigators were hired to search out evidence of adultery
Adultery

Adultery is the voluntary sexual intercourse between a marriage and another person who is not his or her spouse, though in many places it is only considered adultery when a married woman has sexual relations with someone who is not her husband and in others it is only considered adultery when a married woman has sexual relations with someon...
 or other illegal conduct within marriage
Marriage

Marriage is a social, spirituality, or law union of individuals. This union may also be called matrimony, while the ceremony that marks its beginning is usually called a wedding and the married status created is sometimes called wedlock....
 to establish grounds for a divorce. Despite the lack of legal necessity for such evidence in many jurisdictions, according to press reports collecting evidence of adultery or other "bad behavior" by spouses and partners is still one of the most profitable activities investigators undertake, as the stakes being fought over now are child custody
Child custody

Child custody and legal guardian are legal terms which are sometimes used to describe the legal and practical relationship between a parent and his or her child, such as the right of the parent to make decisions for the child, and the parent's duty to care for the child....
, alimony
Alimony

Alimony, maintenance or spousal support is an obligation established by law in many countries that is based on the premise that both spouses have an absolute obligation to support each other during the marriage unless they are legally separated....
, or marital property disputes.

Many jurisdictions require PIs to be licensed, and they may or may not carry firearm
Firearm

A firearm is a tool that projects either single or multiple projectiles at high velocity through a controlled explosion. The firing is achieved by the gases produced through rapid, confined combustion of a propellant....
s depending on local laws. Some are ex-police officer
Police officer

A police officer is a Warrant employee of a police force. Police officers are generally responsible for apprehending criminals, maintaining public order, and preventing and detecting crimes....
s, although many are not. They are expected to keep detailed notes and to be prepared to testify in court
Court

A court is a body, often a government institution, with the authority to adjudication legal disputes and dispense private law, criminal justice, or administrative law justice in accordance with rules of law....
 regarding any of their observations on behalf of their clients. Great care is required to remain within the scope of the law, otherwise the investigator may face criminal charges. Irregular hours may also be required when performing surveillance
Surveillance

Surveillance is the monitoring of behavior. Systems surveillance is the process of monitoring the behavior of people, objects or processes within systems for conformity to expected or desired Norm in trusted systems for security or social control....
 work.

PIs also engage in a large variety of work that is not usually associated with the industry in the mind of the public. For example, many PIs are involved in process serving, the personal delivery of summons, subpoena
Subpoena

A subpoena is commonly defined as a written command to a person to testify before a court or be punished.More accurately, a subpoena is the conditional threat of punishment made by a governmental authority....
s and other legal documents to parties in a legal case. The tracing of absconding debtors can also form a large part of a PI's work load. Many agencies specialize in a particular field of expertise. For example, some PI agencies deal only in tracing. Others may specialize in technical surveillance countermeasures (TSCM), or Electronic Counter Measures
Technical Surveillance Counter-Measures

TSCM is the original United States of America military abbreviation denoting the process of Covert listening device-sweeping or electronic countersurveillance....
 (ECM), which is the locating and dealing with unwanted forms of electronic surveillance (for example, a bugged boardroom for industrial espionage purposes). Other PIs, also known as Corporate Investigators, specialise in corporate matters, including anti-fraud work, the protection of intellectual property
Intellectual property

Intellectual property are law property over creations of the mind, both artistic and commercial, and the corresponding fields of law. Under intellectual property law, owners are granted certain exclusive rights to a variety of intangible assets, such as musical, literary, and artistic works; ideas, discoveries and inventions; and words, phra...
 and trade secret
Trade secret

A trade secret is a formula, Best practice, process, design, Legal instrument, pattern, or compilation of information which is not generally known or reasonably ascertainable, by which a business can obtain an economic advantage over competitors or customers....
s, anti-piracy, copyright infringement
Copyright infringement

Copyright infringement is the unauthorized use of material that is covered by copyright law, in a manner that violates one of the copyright owner's exclusive rights, such as the right to reproduce or perform the copyrighted work, or to make derivative works....
 investigations, due diligence
Due diligence

Due Diligence is a term used for a number of concepts involving either the performance of an investigation of a business or person, or the performance of an act with a certain standard of care....
 investigations and computer forensics
Computer forensics

Computer forensics is a branch of forensic science pertaining to legal evidence found in computers and digital storage mediums. Computer forensics is also known as digital forensics....
 work.

Increasingly, modern PIs prefer to be known as "professional investigators" or Licensed Private Investigators(LPI's) rather than "private investigators" or "private detectives". This is a response to the image that is sometimes attributed to the profession and an effort to establish and demonstrate the industry to be a proper and respectable profession.

Global focus

In some countries private investigations are illegal, but they thrive in other countries, including: Australia
Australia

Australia, officially the Commonwealth of Australia, is a country in the southern hemisphere comprising the Australia of the world's smallest continent, the major island of Tasmania, and numerous list of islands of Australia in the Indian Ocean and Pacific Oceans....
, Canada
Canada

Canada is a country occupying most of northern North America, extending from the Atlantic Ocean in the east to the Pacific Ocean in the west and northward into the Arctic Ocean....
, Austria
Austria

Austria , officially the Republic of Austria , is a landlocked country in Central Europe. It borders both Germany and the Czech Republic to the north, Slovakia and Hungary to the east, Slovenia and Italy to the south, and Switzerland and Liechtenstein to the west....
, Japan
Japan

Japan is an island country in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, People's Republic of China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south....
, Mexico
Mexico

The United Mexican States , commonly known as Mexico , is a federalism constitutionalism republic in North America. It is bordered on the north by the United States; on the south and west by the Pacific Ocean; on the southeast by Guatemala, Belize, and the Caribbean Sea; and on the east by the Gulf of Mexico....
, the Netherlands, the United Kingdom
United Kingdom

The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom , the UK or Britain,is a sovereign state located off the northwestern coast of continental Europe....
, the United States
United States

The United States of America is a Federal government constitutional republic comprising U.S. state and a federal district. The country is situated mostly in central North America, where its Contiguous United States and Washington, D.C., the Capital districts and territories, lie between the Pacific Ocean and Atlantic Oceans, Borders of the U...
, South Africa
South Africa

The Republic of South Africa, also known by Official names of South Africa, is a country located at the southern tip of the continent of Africa....
, Spain
Spain

Spain or the Kingdom of Spain , is a country located in Southern Europe on the Iberian Peninsula.The Spanish constitution does not establish any official denomination of the country, even though Espa?a , Estado espa?ol and Naci?n espa?ola are used interchangeably....
, and Turkey
Turkey

Turkey , known officially as the Republic of Turkey , is a Eurasian country that stretches across the Anatolian peninsula in southwest Asia and Thrace in the Balkans region of Southern Europe....
. In South Africa
South Africa

The Republic of South Africa, also known by Official names of South Africa, is a country located at the southern tip of the continent of Africa....
, private investigators are in very high demand due to poor police work and high crime rates. Other countries throughout the world have private investigators, but many of their duties are restricted. In South Korea
South Korea

South Korea, officially the Republic of Korea , ), often referred to as Korea and the "names of Korea#Revival of the names", is a Semi-presidential system republic in East Asia, located in the southern half of the Korean Peninsula....
, for example, surveillance
Surveillance

Surveillance is the monitoring of behavior. Systems surveillance is the process of monitoring the behavior of people, objects or processes within systems for conformity to expected or desired Norm in trusted systems for security or social control....
 is allowed only in insurance fraud situations. Some countries in the world require licensing of private detectives, but most do not.

Working conditions

Private detectives and investigators often work irregular hours because of the need to conduct surveillance
Surveillance

Surveillance is the monitoring of behavior. Systems surveillance is the process of monitoring the behavior of people, objects or processes within systems for conformity to expected or desired Norm in trusted systems for security or social control....
 and contact people who are not available during normal working hours. Early morning, evening, weekend, and holiday
Holiday

The words holiday or vacation have related meanings in different English language countries and continents, but will usually refer to one of the following activities or events:...
 work is common.

Many detectives and investigators spend time away from their offices conducting interviews or doing surveillance, but some work in their office most of the day conducting computer searches and making telephone
Telephone

The telephone is a telecommunications device that is used to transmitter and receive electronically or digitally encoded sound between two or more people conversing....
 calls. Those who have their own agencies and employ other investigators may work primarily in an office and have normal business
Business

A business is a legally recognized organization designed to provide good s and/or Service to consumers. Businesses are predominant in capitalism economies, most being privately owned and formed to earn profit that will increase the wealth of its owners....
 hours.

When the private investigator is working on a case away from the office, the environment might range from plush boardrooms to seedy bars. Store
Store detective

A store detective is employed to deter and detect theft in retail outlets. The term is no longer frequently used in the retail industry. More common terms today with major retailers are Loss Prevention Agent, Detective or Investigator and Asset Protection Officer or Investigator....
 and hotel detective
Hotel Detective

A hotel detective is a security guard employed by a hotel. Hotel detectives feature prominently in certain noir fiction, especially in the works of Raymond Chandler, and are sometimes referred to as "House Dicks"....
s work in the businesses that they protect. Investigators generally work alone, but they sometimes work with others during surveillance or when following a subject in order to avoid detection.

Some of the work involves confrontation, so the job can be stressful and dangerous. Some situations call for the investigator to be armed, such as certain bodyguard
Bodyguard

A bodyguard is a type of security guard or government agent who protects a person?usually a famous, wealthy, or politically important figure?from assault, kidnapping, assassination, stalking, loss of Confidentiality, or other threats....
 assignments for corporate or celebrity
Celebrity

A celebrity is a widely-recognized or notable person who commands a high degree of public and media attention. The word stems from the Latin verb "celebrare" but one may not become a celebrity unless public and mass media interest is piqued....
 clients, although this will depend on the laws of the country in which the investigator works. Detectives and investigators who carry handguns must be licensed by the appropriate authority. In most cases, however, a weapon is not necessary, because the purpose of the work is gathering information and not law enforcement or criminal apprehension.

Training, other qualifications, and advancement

There are no formal education requirements for most private detective and investigator jobs, although many private detectives have college degrees or have taken legal or criminal investigation courses. Private detectives and investigators typically have previous experience in other occupations. Some work initially for insurance companies as insurance adjusters. They are then promoted to special investigator and are assigned to investigate insurance claims that have the ear marks of fraud. Insurance investigators, also called fraud investigators, are assigned to special investigation units (SIU), throughout the world where the insurance company has claims offices or field branch offices. Many SIU employees work out of their homes. Travel can be extensive. Collections companies use PI's for locating debtors in the field. PI's are born in the private security industry, or as paralegal
Paralegal

Paralegal is a term used in many countries to describe non-lawyers who assist lawyers in their legal work.Paralegals are not lawyers. They are not authorized by government to offer legal services in the same way, nor are they officers of the court , nor are they usually subject to government/court sanctioned rules of conduct....
s. Many investigators enter the field after serving in the police
Police

Police are agents or agencies, usually of the executive , empowered to enforce the law and to ensure public and social order through the legitimized use of force....
, the military
Military

A military is an organization authorized by its nation to use force, usually including use of weapons, in defending its country by combating actual or Threat of force ....
, government auditing and investigative positions, or intelligence
Intelligence (information gathering)

Intelligence is not information, but the product of evaluated information, valued for its currency and relevance rather than its detail or accuracy —in contrast with "data" which typically refers to precision or particular information, or "fact," which typically refers to veracity information....
 jobs.

Former police officers, military investigators and government agents, who are frequently able to retire after 20 or 25 years of service, often become private detectives or investigators in a second career. Others enter from such diverse fields as finance
Finance

The field of finance refers to the concepts of time, money and risk and how they are interrelated. Banks are the main facilitators of funding through the provision of credit, although private equity, mutual funds, hedge funds, and other organizations have become important....
, accounting, commercial credit, investigative reporting, insurance
Insurance

Insurance, in law and economics, is a form of risk management primarily used to Hedge against the risk of a contingent loss. Insurance is defined as the equitable transfer of the risk of a loss, from one entity to another, in exchange for a premium, and can be thought of as a guaranteed small loss to prevent a large, possibly devastating los...
, and law. These individuals often can apply their prior work experience in a related investigative specialty. A few enter the occupation directly after graduation from college
College

File:Government college for Women Dhoke Kala Khan.JPGCollege is a term most often used today to denote an education institution. More broadly, it can be the name of any group of collegialitys, for example, an electoral college, a College of Arms or the College of Cardinals....
, generally with associate's
Associate's degree

An associate degree is an academic degree awarded by community colleges, junior colleges, four-year universities, business colleges and some bachelor's degree-granting colleges/universities upon completion of a course of study usually lasting two years....
 or bachelor's degree
Bachelor's degree

A bachelor's degree is usually an undergraduate academic degree awarded for a course or major that generally lasts for three, four, or in some cases and countries, five or six years....
s in criminal justice
Criminal justice

Criminal justice is the system of practices, and organizations, used by national and local governments, directed at maintaining social control, Deterrence and controlling crime, and sanctioning those who violate laws with criminal penalties....
, police science
Police science

Police science is often an ambiguous term that denotes the studies and research which directly or indirectly deal with police work. Studies and research in criminology, forensic science, psychology, jurisprudence, community policing, criminal justice, correctional administration and penology all come under this umbrella term 'police science'....
 or with a private investigation diploma.

The majority of states
U.S. state

A U.S. state is any one of the 50 state of the United States that share sovereignty with the federal government of the United States . Because of this shared sovereignty, an United States is a citizen both of the federal entity and of his or her state of Domicile ....
 in the United States
United States

The United States of America is a Federal government constitutional republic comprising U.S. state and a federal district. The country is situated mostly in central North America, where its Contiguous United States and Washington, D.C., the Capital districts and territories, lie between the Pacific Ocean and Atlantic Oceans, Borders of the U...
 and the District of Columbia require private detectives and investigators to be licensed. Licensing requirements vary, however. Seven states—Alabama
Alabama

Alabama is a state located in the Southern United States of the United States of America. It is bordered by Tennessee to the north, Georgia to the east, Florida and the Gulf of Mexico to the south, and Mississippi to the west....
, Alaska
Alaska

Alaska is the largest U.S. state of the United States by area; it is situated in the northwest extremity of the North American continent, with Canada to the east, the Arctic Ocean to the north, and the Pacific Ocean to the west and south, with Russia further west across the Bering Strait....
, Colorado
Colorado

The State of Colorado is a U.S. state located in the Mountain States of the United States of America. Colorado may also be considered to be a part of the Western United States and Southwestern United States regions of the United States....
, Idaho
Idaho

The State of Idaho is a U.S. state in the Pacific Northwest region of the United States of America. The state's largest city and Capital is Boise, Idaho....
, Mississippi
Mississippi

Mississippi is a U.S. state located in the Deep South of the United States. Jackson, Mississippi is the state capital and largest city. The state's name comes from the Mississippi River, which flows along its western boundary, and takes its name from the Anishinaabe language word misi-ziibi ....
, Missouri
Missouri

Missouri is a U.S. state in the Midwestern United States of the United States bordered by Iowa, Illinois, Kentucky, Tennessee, Arkansas, Oklahoma, Kansas and Nebraska....
, and South Dakota
South Dakota

South Dakota is a U.S. state located in the Midwestern United States of the United States of America. It is named after the Lakota people and Sioux Sioux Native Americans in the United States tribes....
—have no statewide licensing requirements, some states have very few requirements, and many other states have stringent regulations. A growing number of states are enacting mandatory training programs for private detectives and investigators. For example, the Bureau of Security and Investigative Services of the California
California

California is a U.S. state on the West Coast of the United States of the United States, along the Pacific Ocean. It is bordered by Oregon to the north, Nevada to the east, Arizona to the southeast, and to the south the Mexico state of Baja California....
 Department of Consumer Affairs requires private investigators to be 18 years of age or older, have a combination of education in police science, criminal law, or justice and experience equalling three years (6,000 hours) of investigative experience, pass a criminal history background check by the California Department of Justice and the FBI (in most states, convicted felon
Felon

Felon may refer to:* Someone who commits a felony* Whitlow, a purulent inflammation of the pulp of a finger* A slang term for Summer Mastitis in cows in the United Kingdon...
s cannot be issued a license), and receive a qualifying score on a two-hour written examination covering laws and regulations. There are additional requirements for a firearms permit.

While in a state such as Rhode Island an applicant would have to present a requirement of five years experience with an established private detective, an associates degree, be a police officer for five years, or an equivalent. Once one of the requirements is met one may apply to the local town council after which be given a license to conduct business.

For private detective and investigative jobs, most employers look for individuals with ingenuity, persistence, and assertiveness. A candidate must not be afraid of confrontation, should communicate well, and should be able to think on his or her feet. Good interviewing and interrogation
Interrogation

Interrogation or questioning is interviewing as commonly employed by officers of the police and military.The interviewee is also referred to as a "source"....
 skills also are important and usually are acquired in earlier careers in law enforcement or other fields. Because the court
Court

A court is a body, often a government institution, with the authority to adjudication legal disputes and dispense private law, criminal justice, or administrative law justice in accordance with rules of law....
s often are the ultimate judge
Judge

A judge, or arbiter of justice, is a lead official who presides over a court of law,which is operated by the local, state, and/or federal government....
 of a properly conducted investigation, the investigator must be able to present the facts in a manner that a jury
Jury

A jury is a sworn body of people convened to render a rationalism, impartiality verdict officially submitted to them by a court, or to set a sentence or judgment....
 will believe.

Training in subjects such as criminal justice and police science can be helpful to aspiring private detectives and investigators. Most corporate investigators must have a bachelor's degree, preferably in a business-related field. Some corporate investigators have a master's degree
Master's degree

A master's degree provides a mastery or high-order overview of a specific field of study or area of profession. Within the area studied, graduates possess advanced knowledge of a specialized body of theory and applied topics; high order skills in analysis, Critical thinking and/or professional application; and the ability to problem solving a...
 in business administration or a law degree
Law degree

A Law degree is the degree conferred on someone who successfully completes studies in law. However many law degrees are insufficient education for a license to practice law by the administrative body of that jurisdiction....
, while others are CPAs
Certified Public Accountant

Certified Public Accountant is the statutory title of qualified accountants in the United States who have passed the Uniform Certified Public Accountant Examination and have met additional state education and experience requirements for certification as a CPA....
. Corporate investigators hired by large companies may receive formal training from their employers on business practices, management structure, and various finance-related topics. The screening process for potential employees typically includes a background check for a criminal history.

Some investigators receive certification from a professional organization to demonstrate competency in a field. For example, the National Association of Legal Investigators (NALI) confers the Certified Legal Investigator designation to licensed investigators who devote a majority of their practice to negligence or criminal defense investigations. To receive the designation, applicants must satisfy experience, educational, and continuing-training requirements and must pass written and oral exams administered by the NALI.

Most private-detective agencies are small, with little room for advancement. Usually, there are no defined ranks or steps, so advancement takes the form of increases in salary and assignment status. Many detectives and investigators work for detective agencies at the beginning of their careers and, after a few years, start their own firms. Corporate and legal investigators may rise to supervisor or manager of the security or investigations department.

The median salary for a private investigator in the U.S. is $32,110 USD, according to 2004 data.

History of the private investigator

In 1833 Eugène François Vidocq
Eugène François Vidocq

Eug?ne Fran?ois Vidocq was a France criminal who later became the first director of S?ret? and one of the first modern private investigators....
, a French
France

France , officially the French Republic , is a country whose Metropolitan France is located in Western Europe and that also comprises various Overseas departments and territories of France....
 soldier
Soldier

A soldier is a general English term that refers to a land component of national armed forces.In most societies of the world, "soldier" is also a general term for any member of the land forces including Commissioned officer and non-commissioned officers....
, criminal and privateer, founded the first known private detective agency, "Le Bureau des Renseignements Universels pour le commerce et l'Industrie" ("The Office of Universal Information For Commerce and Industry") and hired ex-convicts. Official law enforcement tried many times to shut it down. In 1842 police arrested him in suspicion of unlawful imprisonment and taking money on false pretences after he had solved an embezzling case. Vidocq later suspected that it had been a set-up. He was sentenced for five years with a 3,000-franc
Franc

The franc is the name of several currency units, most notably the French franc, the currency of France until it adopted the euro in 1999 , and the Swiss franc, still a major world currency today due to the prominence of Switzerland Banking in Switzerland....
 fine but the Court of Appeals released him. Vidocq is credited with having introduced record-keeping, criminology
Criminology

Criminology is the social science approach to the study of crime as an individual and social phenomenon. Criminological research areas include the incidence and forms of crime as well as its causes and consequences....
 and ballistics
Ballistics

Ballistics is the science of mechanics that deals with the flight, behavior, and effects of projectiles, especially bullets, gravity bombs, rockets, or the like; the science or art of designing and accelerating projectiles so as to achieve a desired performance....
 to criminal investigation. He made the first plaster casts of shoe impressions. He created indelible ink
Ink

An ink is a liquid containing various pigments and/or dyes used for coloring a surface to produce an , writing, or design. Ink is used for drawing and/or writing with a pen, brush or quill....
 and unalterable bond paper with his printing company. His form of anthropometrics
Anthropometry

Anthropometry , in physical anthropology, refers to the measurement of the human individual for the purposes of understanding human physical variation....
 is still partially used by French police. He is also credited for philanthropic pursuits – he claimed he never informed on anyone who had stolen for real need.

After Vidocq, the industry was born. Much of what private investigators did in the early days was to act as the police in matters that their clients felt the police were not equipped for or willing to do. A larger role for this new private investigative industry to was to assist companies in labor disputes. Some early private investigators provided armed guards to act as a private militia.

In the United Kingdom, the Hungarian, Ignatius Paul Pollaky
Ignatius Paul Pollaky

Ignatius Paul Pollaky also known as "Paddington" Pollaky, born in Hungary, became one of the first and best-known professional private detectives in Britain....
, set up an agency in 1862. Although little remembered today, his fame at the time was such that he was mentioned in various books of the 1870s and immortalized as "Paddington" Pollaky for his "keen penetration" in the comic opera, Patience
Patience (opera)

Patience, or Bunthorne's Bride, is a comic opera in two acts, with music by Arthur Sullivan and libretto by W. S. Gilbert. First performed at the Opera Comique, London, on April 23 1881, it moved to the 1,292-seat Savoy Theatre on October 10 1881, where it was the first theatrical production in the world to be lit entirely by electric li...
.

In the U.S., the Pinkerton National Detective Agency
Pinkerton National Detective Agency

The Pinkerton National Detective Agency, usually shortened to the Pinkertons, was a private United States security guard and detective agency established by Allan Pinkerton in 1850....
 was a private detective agency established in 1850 by Allan Pinkerton
Allan Pinkerton

Allan Pinkerton was a Scotland detective and espionage, best known for creating the Pinkerton Agency, the first detective agency of the United States....
. Pinkerton had become famous when he foiled a plot to assassinate then President-Elect Abraham Lincoln
Abraham Lincoln

Abraham Lincoln was the List of Presidents of the United States President of the United States. He successfully led the country through its greatest internal crisis, the American Civil War, preserving the Union and ending slavery....
. Pinkerton's agents performed services which ranged from undercover investigations and detection of crimes to plant protection and armed security. It is sometimes claimed, probably with exaggeration, that at the height of its existence the Pinkerton National Detective Agency employed more agents than the United States Army
United States Army

The United States Army is the branch of the United States Armed Forces responsible for Army operations. It is the largest and oldest established branch of the U.S....
.

During the labor unrest of the late 19th century, companies sometimes hired operatives and armed guards from the Pinkertons and similar agencies to keep strikers and suspected unionists out of their factories. The most famous example of this was the Homestead Strike
Homestead Strike

The Homestead Strike was a labour lockout and strike which began on June 30, 1892, culminating in a battle between strikers and private security agents on July 6, 1892....
 of 1892, when industrialist Henry Clay Frick
Henry Clay Frick

Henry Clay Frick was an United States Robber baron and art patron, once known as "America's most hated man"....
 hired a large contingent of Pinkerton men to regain possession of Andrew Carnegie
Andrew Carnegie

Andrew Carnegie was a Scotland-born United States industrialist, List of business people, and a major philanthropist. He was an immigrant as a child with his parents....
's steel mill during a lock-out at Homestead, Pennsylvania
Homestead, Pennsylvania

Homestead is a borough in Allegheny County, Pennsylvania, Pennsylvania, USA, in the Monongahela River seven miles southeast of downtown Pittsburgh, Pennsylvania but directly across the river from the city limit line....
. Gunfire erupted between the strikers and the Pinkertons, resulting in multiple casualties and deaths on both sides. Several days later a radical anarchist, Alexander Berkman, attempted to assassinate Frick. In the aftermath of the Homestead Riot, several states passed so-called "anti-Pinkerton" laws restricting the importation of private security guards during labor strikes. The federal Anti-Pinkerton Act of 1893 continues to prohibit an "individual employed by the Pinkerton Detective Agency, or similar organization" from being employed by "the Government of the United States or the government of the District of Columbia."

Pinkerton agents were also hired to track western outlaws Jesse James
Jesse James

Jesse Woodson James was an American Old West outlaw in the state of Missouri and the most famous member of the James-Younger Gang. Already a grand celebrity when he was alive, he became a legendary figure of the American Old West after his death....
, the Reno brothers, and the Wild Bunch, including Butch Cassidy
Butch Cassidy

Butch Cassidy , born Robert LeRoy Parker, was a notorious United States train robbery robber, bank robber and leader of the Hole in the Wall Gang....
 and the Sundance Kid. The Pinkerton agency's logo, an eye embellished with the words "We Never Sleep," inspired the term "private eye."

It was not until the prosperity of the 1920s that the private investigator became a person accessible to the average American. With the wealth of the 1920s and the expanding of the middle class came the need of middle America for private investigators.

Since then the private detective industry has grown with the changing needs of the public. Social issues like infidelity
Infidelity

Infidelity can be defined as any violation of the mutually agreed-upon rules or boundaries of a relationship, and is a breach of faith in an interpersonal relationship....
 and unionization have impacted the industry and created new types of work, as has the need for insurance and, with it, insurance fraud, criminal defense investigations and the invention of low-cost listening devices. In a number of countries, a licensing process has been introduced that has put criteria in place that investigators have to meet: in most cases, a clean criminal record. This has combined with modern business practices that have ensured that most investigators are now professional in outlook, rather than seeing the PI world as a second career opportunity for retired policemen.

Private investigators in fiction


The PI genre in fiction dates back to Edgar Allan Poe
Edgar Allan Poe

Edgar Allan Poe was an American poet, Short story writer, Editing and Literary criticism, and is considered part of the American Romanticism. Best known for his tales of Mystery and the macabre, Poe was one of the earliest American practitioners of the short story and is considered the inventor of the Detective fiction genre....
 who created the character C. Auguste Dupin, who lived in Paris
Paris

Paris is the Capital of France and the country's largest city. It is situated on the river Seine, in northern France, at the heart of the ?le-de-France Regions of France ....
. Another famous fictional private detective would be Sherlock Holmes
Sherlock Holmes

Sherlock Holmes is a fictional character of the late nineteenth and early twentieth centuries, who first appeared in publication in 1887. He is the creation of Scotland-born author and physician Sir Arthur Conan Doyle....
, created by Arthur Conan Doyle
Arthur Conan Doyle

Sir Arthur Ignatius Conan Doyle, Deputy Lieutenant was a Scotland author most noted for his stories about the Detective fiction Sherlock Holmes, which are generally considered a major innovation in the field of crime fiction, and for the adventures of Professor Challenger....
. The genre spread to films, radio and television and remains popular to this day in many forms of media.

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