California Code, Business and Professions Code - BPC § 22435.5

(a) In any civil proceeding, any shopping cart or laundry cart which has a sign affixed to it pursuant to Section 22435.1 shall establish a rebuttable presumption affecting the burden of producing evidence that the property is that of the person or business named in the sign and not abandoned by the person or business named in the sign.

(b) In any criminal proceeding, it may be inferred that any shopping cart or laundry cart which has a sign affixed to it pursuant to Section 22435.1 is the property of the person or business named in the sign and has not been abandoned by the person or business named in the sign.