Criminal investigator

Definition and stakes

Portrait of Arthur Cheney Train Arthur Cheney Train,  Courts and Criminals

“ There are two classes of cases where a private detective must needs be used, if indeed any professional assistance is to be called in: first, where the person whose identity is sought to be discovered or whose activities are sought to be terminated is not a criminal or has committed no crime, and second, where, though a crime has been committed, the injured parties cannot afford to undertake a public prosecution. ”
Source: Gutenberg

Portrait of Earl Warren Earl Warren,  Terry v. Ohio — Opinion of the Court

“ One general interest is of course that of effective crime prevention and detection; it is this interest which underlies the recognition that a police officer may in appropriate circumstances and in an appropriate manner approach a person for purposes of investigating possibly criminal behavior even though there is no probable cause to make an arrest. ”
Source: Wikisource

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