AB 346 - Identity Confirmation Act: (2015) Became law in 1/2016
Bill to amend vehicle Code section 40302 providing that a person who is lawfully detained must present their face as part of the identification process. Refusing to show the driver's face to law enforcement today, is not illegal; there is no requirement in law for example that a motorcycle rider to remove their helmet during a traffic stop.
The idea for the law, which is primarily targeted at helmeted motorcyclists, came from a Simi Valley patrol officer (Coulter).
https://leginfo.legislature.ca.gov/.../billNavClient...