California Code, Civil Code - CIV § 1749.64

Notwithstanding any other provision of law, no club card issuer shall request in a supermarket club card application, or require as a condition of obtaining a supermarket club card, that an applicant provide a driver's license number or a social security account number.  This section shall not be construed to prohibit a club card issuer from requesting a driver's license number or a social security account number for a supermarket club card that can also be used as identification for check cashing purposes or to debit the checking or savings account of the cardholder.  However, no club card issuer shall, as a condition of obtaining a supermarket club card, require a cardholder to obtain a supermarket club card that can also be used as identification for check cashing purposes or to debit the checking or savings account of the cardholder.