In Lingo v. City of Salem, published June 27, 2016, the 9th Circuit Court of Appeals affirmed summary judgment in favor of defendant police officers in a case brought under 42 U.S.C. section 1983 alleging that the officers arrested the plaintiff without probable cause. The officers were approaching the plaintiff's house to discuss a neighbor's dispute with her. Instead of approaching the front door, the officers walked through the plaintiff's carport and knocked on the rear door inside the carport. When the door opened, they smelled marijuana. When the officers saw a minor child, and confirmed the plaintiff lived with her minor children, they arrested her for endangering the welfare of a minor. They then obtained a warrant and searched her house. Before the trial of the criminal case against her, the trial court excluded the evidence the police collected as the fruit of the officers' initial entry into the curtilage of the house, which the court ruled violated the 4th Amendment. The charges were dropped. When the plaintiff sued the officers, she argued that the officers violated her 4th Amendment rights, and tried to prevent the officers from introducing the evidence they obtained to show probable cause to arrest. The district court agreed that the officers violated the 4th Amendment, but declined to exclude the evidence and concluded that the officers had probable cause to arrest the plaintiff.
The 9th Circuit agreed. The exclusionary rule is not itself a constitutional right. It is a judicially-created remedy for unconstitutionally-obtained evidence in criminal prosecutions. Its deterrent effect would be limited in civil cases. The 9th Circuit joined other circuit courts in concluding that the exclusionary rule does not apply in section 1983 cases. It also rejected the argument that the 4th Amendment prohibits any arrest justified based solely on evidence obtained from unlawful searches.