California Code, Financial Code - FIN § 23037

(a) Accept or use the same check for a subsequent transaction, or permit a customer to pay off all or a portion of one deferred deposit transaction with the proceeds of another.

(b) Accept any collateral for a deferred deposit transaction.

(c) Make any deferred deposit transaction contingent on the purchase of insurance or any other goods or services.

(d) Enter into a deferred deposit transaction with a person lacking the capacity to contract.

(e) Alter the date or any other information on a check.

(f) Engage in any unfair, unlawful, or deceptive conduct, or make any statement that is likely to mislead in connection with the business of deferred deposit transactions.

(g) Accept more than one check for a single deferred deposit transaction.

(h) Take any check, instrument, or form in which blanks are left to be filled in after execution.

(i) Offer, arrange, act as an agent for, or assist a deferred deposit originator in any way in the making of a deferred deposit transaction unless the deferred deposit originator complies with all applicable federal and state laws and regulations, including the provisions of this division.