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A detective is an investigator, either a member of a police agency or a private person. The latter may be known as private investigators (P.I.s or "Private I's", hence the play-on-words, "Private Eyes"). Informally, and primarily in fiction, a detective is any licensed or unlicensed person who solves crimes, including historical crimes, or looks into records. Overview

In some police departments, a detective position is appointed, rather than a position achieved by passing a written test.[citation needed] Prospective British police detectives must have completed at least two years as a uniformed officer before applying to join the Criminal Investigation Department. UK Police must also pass the National Investigators' Examination in order to progress on to subsequent stages of the Initial Crime Investigators Development Programme in order to qualify as a Detective.[1] In many other police systems, detectives are university graduates who join directly from civilian life without first serving as uniformed officers.[citation needed] Some people argue that detectives do a completely different job and therefore require completely different training, qualifications, qualities and abilities than uniformed officers. The opposing argument is that without previous service as a uniformed patrol officer, a detective cannot have a great enough command of standard police procedures and problems and will find it difficult to work with uniformed colleagues. Detectives obtain their position by competitive examination covering such subjects as principles, practices and procedures of investigation; interviewing and interrogation; criminal law and procedures; applicable law governing arrests, search and seizures, warrants and evidence; policedepartment records and reports; principles, practices and objectives of courtroom testimony;and police department methods and procedures.[citation needed]
Sherlock Holmes was a fictional detective of the late nineteenth &early twentieth centuries who first appeared in publication in 1887.

Private detectives or investigation in India[2] are licensed by the state in which they live after passing a competitive examination and a criminal background check. Some states, require a period of classroom training and must have experience with a weapon as well.[citation needed] Organization

The detective branch in most large police agencies is organized into several squads or departments, each of which specializes in investigation into a particular type of crime or a particular type of undercover operation, which may include: homicide; robbery; burglary; auto theft; organized crimes; missing persons; juvenile crimes; fraud; narcotics; vice; criminal intelligence; aggravated assault/battery; sexual assault; computer crime; domestic violence; surveillance; and arson, among others. Techniques

Street work
Detectives have a wide variety of techniques available in conducting investigations. However, the majority of cases are solved by the interrogation of suspects and the interviewing of witnesses, which takes time. Besides interrogations, detectives may rely on a network of informants they have cultivated over the years. Informants often have connections with persons a detective would not be able to approach formally. Evidence collection...
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