Cal. Food & Agric. Code § 10359

It is unlawful for any person, except a federal, state, county, or municipal officer or employee, in his official capacity, or an accredited veterinarian, to buy, possess, or use any device which is designed to produce a mark, stamp, or tattoo that simulates in design the official tattoo, tag, or mark that is adopted by the department and the United States Department of Agriculture for identifying cattle which are officially vaccinated against brucellosis.