This article focus to Define and Discuss on Police Perjury. Very few academic studies and investigative profits have documented police lying under oath from search and seizure cases. The exclusionary rule gives police an incentive to lie in order to avoid letting a suspect they think is guilty go free. Civil libertarians counter with the argument that it is unwise to get rid of the exclusionary rule until the government can put in place another mechanism to assure that the police comply with the Fourth Amendment. Here briefly analysis The Mollen Commission, The blue wall of silence and Solutions for “testilying”.