Section 27340 Of Article 2. Gun Show Enforcement And Security Act Of 2000 From California Penal Code >> Division 6. >> Title 4. >> Part 6. >> Chapter 3. >> Article 2.

. (a) Persons other than show or event security personnel, sworn peace officers, or vendors, who bring firearms onto the gun show or event premises shall sign in ink the tag or sticker that is attached to the firearm prior to being allowed admittance to the show or event, as provided for in subdivision (b).
  (b) All firearms carried onto the premises of a gun show or event by members of the public shall be checked, cleared of any ammunition, secured in a manner that prevents them from being operated, and an identification tag or sticker shall be attached to the firearm, prior to the person being allowed admittance to the show. The identification tag or sticker shall state that all firearms transfers between private parties at the show or event shall be conducted through a licensed dealer in accordance with applicable state and federal laws. The person possessing the firearm shall complete the following information on the tag before it is attached to the firearm:
  (1) The gun owner's signature.
  (2) The gun owner's printed name.
  (3) The identification number from the gun owner's government-issued photo identification.