Cal. Health & Safety Code § 11852.5
(c) Services shall not be denied because of a client’s ability or inability to pay. County-operated and contract providers of treatment services shall set and collect fees using methods approved by the county alcohol and drug program administrator. All approved fee systems shall conform to all of the following guidelines and criteria:
(d) To ensure an audit trail, the county or provider, or both, shall maintain all of the following records:
(h)