Cal. Welf. & Inst. Code § 18902.5
(d) Each county which operates an early fraud prevention and detection program shall be subject to all of the following conditions:
(6) The county shall make a referral for welfare fraud investigation when there is reason to believe that fraud exists. Fraud exists when a person, on behalf of himself or herself or others, has done any of the following:
(7) The county shall make a referral for fraud investigation when there are reasonable grounds to believe that fraud, as specified in paragraph (6) exists. Reasonable grounds exist when one or more of the following criteria exists: