In which case did the Supreme Court uphold confession evidence obtained through the use of a "jail plant"?

Question

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In Illinois v. Perkins, the Supreme Court held that an undercover agent posing as a fellow inmate could elicit a confession without the warnings prescribed by Miranda v. Arizona, as the suspect is not compelled to speak by governmental coercion, thus upholding the confession evidence obtained through the use of a "jail plant."

In Which Case Did the Supreme Court Uphold Confession Evidence