State lawmakers are urging the adoption of a "kill switch" for smartphones.

Citing skyrocketing thefts, Assemblywoman Nancy Skinner wants technology on all phones sold in California that can disable functionality if they're stolen,

"Theives do not want a device that does not work," she proclaimed.

Skinner joined Senator Mark Leno in unveiling a proposal for 2015.  San Francisco Police Chief Greg Suhr is a supporter, he says 50% of all robberies in his city involve a phone.

"The crooks themselves call it, 'apple picking.'  This legislation makes the apples not worth picking," he explained.

There has been pushback from various cell phone companies, though some already have some similar technology in place.