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The California Highway Patrol confirmed to The Los Angeles Times that the citation was issued for violating California Vehicle Code 27602:
A person shall not drive a motor vehicle if a television receiver, a video monitor, or a television or video screen, or any other similar means of visually displaying a television broadcast or video signal that produces entertainment or business applications, is operating and is located in the motor vehicle at a point forward of the back of the driver's seat, or is operating and the monitor, screen, or display is visible to the driver while driving the motor vehicle.
Google have a solution to this; drivers just have to wait for the self-driving Google car.
As I understand it, the device was off, but the cop had no way of knowing that.