Weeks v. United States

Weeks v. United States was a 1914 decision by the United States Supreme Court case in which the Court unanimously held that the warrantless seizure of items from a private residence constitutes a violation of the Fourth Amendment.

It also prevented local officers from securing evidence by means prohibited under the federal exclusionary rule and giving it to their federal colleagues. It was not until the case of Mapp v. Ohio that the exclusionary rule was deemed to apply to state courts as well.