The United States Supreme Court has the final word with regard to the interpretation of the United States Constitution, including the Fourth Amendment. The Fourth Amendment prohibits the Government from engaging in unreasonable searches and seizures. It requires, subject to a growing list of exceptions, the Government to obtain a warrant based upon probable cause prior to engaging in a search.
In the case of Riley v. California, the police made a traffic stop of Riley and determined he was driving on a suspended driver’s license. The Supreme Court long ago held that the police may search a person, as well as the area within his immediate control, without probable cause when the search is made “incident to arrest”. This exception is based upon police safety and the possibility of the destruction of evidence of a crime.
In making the search incident to Riley’s arrest, police located his cell phone. Thereafter, they explored the contents of his phone and found evidence he was a member of a street gang and may have been involved with a recent murder. This all led to additional charges being filed.