California Code, Penal Code - PEN § 18275

(a) Any firearm or other deadly weapon that has been taken into custody and held by any of the following law enforcement authorities for longer than 12 months, and has not been recovered by the owner or person who had lawful possession at the time it was taken into custody, shall be considered a nuisance and destroyed as provided in subdivision (a) of Section 18005:

(b) If a firearm or other deadly weapon is not recovered within 12 months due to an extended hearing process as provided in Section 18420, it is not subject to destruction until the court issues a decision, and then only if the court does not order the return of the firearm or other deadly weapon to the owner.