California Code, Penal Code - PEN § 29825

(a) A person who purchases or receives, or attempts to purchase or receive, a firearm knowing that the person is prohibited from doing so in any jurisdiction by a temporary restraining order or injunction issued pursuant to Section 527.6, 527.8, or 527.85 of the Code of Civil Procedure, a protective order as defined in Section 6218 of the Family Code, a protective order issued pursuant to Section 136.2 or 646.91 of this code, a protective order issued pursuant to Section 15657.03 of the Welfare and Institutions Code, or by a valid order issued by an out-of-state jurisdiction that is similar or equivalent to a temporary restraining order, injunction, or protective order specified in this subdivision, that includes a prohibition from owning or possessing a firearm, is guilty of a public offense, punishable by imprisonment in a county jail not exceeding one year or in the state prison, by a fine not exceeding one thousand dollars ($1,000), or by both that imprisonment and fine.

(b) A person who owns or possesses a firearm knowing that the person is prohibited from doing so in any jurisdiction by a temporary restraining order or injunction issued pursuant to Section 527.6, 527.8, or 527.85 of the Code of Civil Procedure, a protective order as defined in Section 6218 of the Family Code, a protective order issued pursuant to Section 136.2 or 646.91 of this code, a protective order issued pursuant to Section 15657.03 of the Welfare and Institutions Code, or by a valid order issued by an out-of-state jurisdiction that is similar or equivalent to a temporary restraining order, injunction, or protective order specified in this subdivision, that includes a prohibition from owning or possessing a firearm, is guilty of a public offense, punishable by imprisonment in a county jail not exceeding one year, by a fine not exceeding one thousand dollars ($1,000), or by both that imprisonment and fine.

(c) If probation is granted upon conviction of a violation of this section, the court shall impose probation consistent with Section 1203.097.

(d) The Judicial Council shall provide notice on all protective orders issued within the state that the respondent is prohibited from owning, possessing, purchasing, receiving, or attempting to purchase or receive a firearm while the protective order is in effect. The order shall also state that a firearm owned or possessed by the person shall be relinquished to the local law enforcement agency for that jurisdiction, sold to a licensed firearms dealer, or transferred to a licensed firearms dealer pursuant to Section 29830 for the duration of the period that the protective order is in effect, and that proof of surrender or sale shall be filed within a specified time of receipt of the order. The order shall state the penalties for a violation of the prohibition. The order shall also state on its face the expiration date for relinquishment.