Riley v. California

Previously, the court held officers could conduct warrantless searches of arrestees and possessions within the arrestees’ control, incident to a custodial arrest. The court concluded such searches were reasonable in order to discover weapons or any evidence on the arrestee’s person so that evidence could not be concealed or destroyed.

The court concluded this rationale does not apply to modern cell phones. First, digital data stored on a cell phone cannot be used as a weapon to harm an arresting officer or aid an arrestee in escaping. The court emphasized that police officers may still examine the physical aspects of phone to ensure that it will not be used as a weapon. For example, the court noted a police officer may examine a cell phone to determine whether there is a razor blade hidden between the phone and its case. However, once an officer has secured a phone and eliminated any potential threats the data on the phone cannot harm anyone.

Second, the court stated the government provided little evidence to believe that loss of evidence from a seized cell phone, by remote wiping of the data on the phone, was a common occurrence. Even if remote wiping were a concern, the court listed two ways remote wiping could be prevented. First, the officer could turn the phone off or remove its battery. Second, the officer could put the phone inside a device, called a Faraday bag, that would isolate the phone from radio waves. The court added that Faraday bags are cheap, lightweight, and easy to use and a number of law enforcement agencies already encourage their use. In addition, the court commented that if a police officers are truly confronted with individualized facts suggesting that a defendant’s phone will be the target of an imminent remote wiping attempt, they may be able to rely on exigent circumstances to search that phone immediately.

The court further recognized that cell phones are different from other objects that an arrestee might have on his person. Before cell phones existed, a search of an arrestee generally constituted a small intrusion on the arrestee’s privacy. However, modern cell phones are, in essence, mini-computers that have immense storage capacity on which many people keep a digital record of nearly aspect of their lives. Consequently, the warrantless search of a cell phone constitutes a significant intrusion upon a person’s privacy. If police officers wish to search a cell phone incident to arrest, they need to obtain a warrant.