In law enforcement, a sting operation is a deceptive operation designed to catch a person committing a crime. A typical sting will have an undercover law enforcement officer, detective or co-operative member of the public play a role as criminal partner or potential victim and go along with a suspect's actions to gather evidence of the suspect's wrongdoing. Even mass media journalists resort to sting operations to record video and broadcast to expose criminal activity.
Sting operations are fraught with ethical concerns over whether they constitute entrapment. Law-enforcement may have to be careful not to provoke the commission of a crime by someone who would not otherwise have done so. Additionally, in the process of such operations, the police often engage in the same crimes, such as buying or selling contraband, soliciting prostitutes, etc. In common law jurisdictions, the defendant may invoke the defense of entrapment.
Contrary to popular misconceptions, however, entrapment does not prohibit undercover police officers from posing as criminals or denying that they are police. Entrapment is typically a defense only when suspects are pressured into committing a crime they would probably not have committed otherwise, but the legal definition of this pressure varies greatly from jurisdiction to jurisdiction.
For example, if undercover officers coerced a potential suspect into manufacturing illegal drugs to sell them, the accused could use entrapment as a defense. However, if a suspect is already manufacturing drugs and police pose as buyers to catch them, entrapment usually has not occurred.
(The term "sting" was popularized by the 1973 Robert Redford and Paul Newman movie The Sting, though the film is not about a police operation: it features two grifters and their attempts to con a mob boss out of a large sum of money.)
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