Police advance on demonstrators protesting the killing of teenager Michael Brown on August 17, 2014 in Ferguson, Missouri. Police shot smoke and tear gas into the crowd of several hundred as they advanced near the police command center which has been set up in a shopping mall parking lot. Brown was shot and killed by a Ferguson police officer on August 9. Despite the Brown family's continued call for peaceful demonstrations, violent protests have erupted nearly every night in Ferguson since his death. (Photo by Scott Olson/Getty Images)

SACRAMENTO (CBS SF) – Governor Jerry Brown is expected to sign a California bill into law requiring all new phones to have a remote shutdown feature known as a “kill switch,” but protests in Ferguson, Missouri have sparked a last-ditch effort to stop the bill.

During the protests, the police there have reportedly tried to get journalists and protesters to turn off their video cameras on their phones. Now some people are worried that if all smart phones have kill switches, law enforcement might hack in to them during a protest.

On Friday, a Fellow at the Center for Democracy and Technology wrote:

“If the California bill were in place in Missouri, these officers might deploy the government kill switch alongside tear gas and rubber bullets, using the mandated technology to stop coordination between protesters, cut off access to outside information, and shut down video recordings that can deter police misconduct,” said Jake Laperruque, Fellow at the Center for Democracy & Technology

Now, to be clear, the fear of police misuse of kill switches is not a new argument, it’s one that has been heard before. But the events in Ferguson have now really animated the opposition.

It’s not entirely clear that police would even have the ability to shut down phones. The law requires that the switches be optional, so people can turn them off if they are concerned about being hacked. Second, assuming the switch requires a login, the police would have to basically hack a bunch of phones. Remember that if the police want to disrupt communication at a protest, they already have a much easier alternative – they can shut down the wireless service to an area, sort of like what we saw during the BART protests in 2011.