California Code, Welfare and Institutions Code - WIC § 14026

(a) It is a misdemeanor for a Medi-Cal beneficiary to furnish, give, or lend his Medi-Cal card or labels to any person other than a provider of service as required under Medi-Cal regulations.

(b) It is a misdemeanor for any person to use a Medi-Cal card other than the one which was issued to him or her to obtain health care services. This subdivision shall not apply to the use of a Medi-Cal card of a family member by another family member if the person using the card is, in fact, eligible under this chapter.

(c) This section shall not apply to any peace officer while investigating Medi-Cal fraud or other crimes in performance of his official duties or to any person working under the peace officer's immediate direction, supervision, or instruction when such peace officer has been issued a Medi-Cal card pursuant to Section 14026.5.