In a landmark victory for privacy rights, the Supreme Court today handed down a unanimous decision in Riley v. California mandating that police officers obtain a search warrant before examining the contents of an arrestee’s cell phone. The case arose in part after police officers in California arrested the defendant, Riley, for driving with expired registration tags. After searching through Riley’s cell phone, the police discovered photos and other data that incriminated Riley in a prior crime. Riley claimed the search of his cell phone constituted a violation of his Fourth Amendment right to be free from unreasonable searches and seizures. The Supreme Court agreed.