The exception to the exclusionary rule that permitted federal prosecutors to introduce at trial evidence obtained illegally by state law enforcement agents.
In Weeks v. United States
This double standard gave rise to the silver platter doctrine. State law enforcement agents, often at the request of federal officers, conducted illegal seizures. The evidence obtained was then served up to federal authorities on a “silver platter” and was admissible in federal court because federal officers had not participated in its seizure. In Elkins v. United States
Mapp v. Ohio
Weeks v. United States
Wolf v. Colorado