it is illegal...california vehicle code 27602. (a)--
A person may 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 any point forward
of the back of the driver's seat, or is operating and visible to the
driver while driving the motor vehicle.

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