Carroll v. Carman
Holding: The U.S. Court of Appeals for the Third Circuit erred when it concluded that a police officer is not entitled to qualified immunity from a lawsuit under Section 1983 that alleged, among other things, that he entered their property in violation of the Fourth Amendment when he went into their backyard and onto their deck without a warrant. The police officer did not violate clearly established federal law when he went to a sliding glass door that he believed was a customary entryway that was open to visitors.