California Code, Food and Agricultural Code (Formerly Agricultural Code) - FAC § 18849

It is unlawful for any person to sell, transport, offer for sale or transportation, or receive for transportation, in intrastate commerce, any carcass of any horse, mule, or other equine, or any part of the carcass, or any meat or meat food product thereof, unless it is plainly and conspicuously marked, labeled, or otherwise identified as required by regulations of the director to indicate the animal from which it was derived, and is in compliance with Chapter 5 (commencing with Section 19200) of this part and Chapter 10 (commencing with Section 113025) of Part 6 of Division 104 of the Health and Safety Code.