OR, YOU KNOW, CONGRESS COULD PASS A PRIVACY LAW: Supreme Court may need to decide how private a cellphone is.

More than 85 percent of Americans carry one, and the devices provide authorities with more than just a vast record of a person’s travels and phone calls. Modern smartphones have a memory capacity equal to that of a typical home computer in 2004, capable of storing millions of pages of documents.

“That information is, by and large, of a highly personal nature: photographs, videos, written and audio messages (text, email and voicemail), contacts, calendar appointments, web search and browsing history, purchases and financial and medical records,” Judge Norman H. Stahl of the U.S. Court of Appeals for the 1st Circuit wrote recently. “It is the kind of information one would previously have stored in one’s home.”

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