Informant-A person that gives information to law enforcement about the criminal activity of others.

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Hoffa v. United States, 385 U.S. 293 (1966)-

Arizona v. Fulminante, 499 U.S. 279 (1991)-An FBI informant in jail coerced a confession from a child murder suspect. The informant offered to protect the suspect from abuse from other inmates if the suspect confessed to him about the murder. The court excluded the confession.

Kansas v. Ventris, 556 US 586 (2009)-An informant was put in Ventris's cell prior to trial. The informant heard Ventris admit to robbing and shooting the victim. Ventris later testified at the trial that his accompice did the shooting. The informant acting as an agent of law enforcement, violated Ventris's Sixth Amendment right to counsel. Held: Ventris’s statement to the informant, concededly elicited in violation of the Sixth Amendment , was admissible to impeach his inconsistent testimony at trial.