SAN FRANCISCO (AP) — Legislation unveiled Friday in California would require smartphones and other mobile devices to have a “kill switch” to render them inoperable if lost or stolen — a move that could be the first of its kind in the country.

State Sen. Mark Leno, San Francisco District Attorney George Gascon and other elected and law enforcement officials said the bill, if passed, would require mobile devices sold in or shipped to California to have the anti-theft devices starting next year.