Groh v. Ramirez
A BATF agent had PC to believe that Jeff Groh had illegal weapons and explosives at his Montana ranch house. The agent prepared an affidavit and a search warrant. The magistrate signed the warrant, apparently not reading it any more carefully than the agent had.
The face of the warrant described the place to be searched with great particularity, but in the space where the property to be seized was supposed to have been listed, the agent had apparently pasted the description of the premises. As a result, the warrant did not authorize the seizure of any guns or explosives, but instead purported to authorize the seizure of "a single dwelling residence, two-story in height, blue in color, and has two additions attached to the east."
Relying on this warrant, BATF and local officers entered and searched the Groh home. They were later sued for violating Groh's Fourth Amendment right against unreasonable search. The Supreme Court upheld liability against the agent who obtained the warrant and led the search. The court said this:
"The warrant is plainly invalid. On the requirement of particularity, the warrant failed altogether. The Fourth Amendment requires particularity in the warrant. A warrant that fails to conform to the particularity requirement of the Fourth Amendment is unconstitutional. The warrant was deficient in particularity because it provided no description of the type of evidence sought." (Groh v. Ramirez)