2009 California Fish and Game Code - Section 7332 :: Article 2. Clams Generally, Mollusks, And Crustaceans

7332.  No instrument capable of being used to dig clams may be
possessed between one-half hour after sunset and one-half hour before
sunrise, on any beach of this State, except tools and implements
used in the work of cleaning, repairing, or maintaining such beach
when possessed by a person authorized by appropriate authority to
perform such work.