California Code, Government Code - GOV § 90002

(1) Audits and investigations of lobbying firms and employers of lobbyists shall be conducted biennially covering reports filed during the previous two-year period. If a lobbying firm or lobbyist employer keeps a separate account for all receipts and payments for which reporting is required by this chapter, the requirement of an audit under subdivision (a) of Section 90001 shall be satisfied by an audit of that account and the supporting documentation required to be maintained by Section 86110.

(2) For campaign statements or reports of a candidate, controlled committee, or committee primarily supporting or opposing a candidate, the audit or investigation shall cover all campaign statements and reports filed for the primary and general election, or a special or runoff election, as well as any previous campaign statements or reports filed since the last election for that office. The audit or investigation shall not include statements or reports previously audited under Section 90001 or 90003.

(3) For campaign statements or reports of a committee primarily supporting or opposing a measure, the audit or investigation shall cover all campaign statements and reports filed by the committee in connection with the measure.

(4) For all other committees, the audit or investigation shall cover all campaign statements and reports filed during the previous two calendar years.