Cal. Fish & Game Code § 4755

Any person legally killing a bear in this state shall have the tag countersigned by a fish and game commissioner, a person employed in the department, a person designated for this purpose by the commission, or by a notary public, postmaster, postmistress, peace officer or by an officer authorized to administer oaths, before transporting that bear except for the purpose of taking it to the nearest officer authorized to countersign the tag, on the route being followed from the point where the bear is taken.