The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no Warrants shall issue, but upon probable cause, supported by Oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized.
Amendment 4, United States Constitution
The close of today's unanimous Supreme Court decision: Our answer to the question of what police must do before searching a cell phone seized incident to an arrest is accordingly simple—get a warrant.Riley v. California (PDF), June 25th, 2014
Was that so hard? It's right there, in ink on parchment: get a damn warrant.