California Code, Penal Code - PEN § 18420

(a) If, at a hearing under Section 18410, the court does not order the return of the firearm or other deadly weapon to the owner or person who had lawful possession, that person may petition the court for a second hearing within 12 months from the date of the initial hearing.

(b) If there is a petition for a second hearing, unless it is shown by clear and convincing evidence that the return of the firearm or other deadly weapon would result in endangering the victim or the person reporting the assault or threat, the court shall order the return of the firearm or other deadly weapon and shall award reasonable attorney's fees to the prevailing party.

(c) If the owner or person who had lawful possession does not petition the court within this 12-month period for a second hearing or is unsuccessful at the second hearing in gaining return of the firearm or other deadly weapon, the firearm or other deadly weapon may be disposed of as provided in Sections 18000 and 18005.