One common technique of criminal investigation is the use of an undercover agent or decoy—the policeman who poses as a buyer of drugs from a street dealer or the elaborate “sting” operations in which ostensibly stolen goods are “sold” to underworld “fences.” Sometimes these methods are the only way by which certain kinds of crime can be rooted out and convictions secured.
But a rule against entrapment limits the legal ability of the police to play the role of criminals. The police are permitted to use such techniques to detect criminal activity; they are not permitted to do so to instigate crime. The distinction is usually made between a person who intends to commit a crime and one who does not. If the police provide the former with an opportunity to commit a criminal act—the sale of drugs to an undercover agent, for example—there is no defense of entrapment. But if the police knock on the door of one not known to be a drug user and persist in a demand that he purchase drugs from them, finally overcoming his will to resist, a conviction for purchase and possession of drugs can be overturned on the ground of entrapment.
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