California Code, Food and Agricultural Code (Formerly Agricultural Code) - FAC § 52363

(a) Any sample which is taken by an enforcement officer in accordance with the regulations which are adopted pursuant to this chapter for the taking of official samples is prima facie evidence of the true condition of the entire lot from which the sample was taken. The presumption established by this subdivision is a presumption affecting the burden of proof.

(b) A written report which is issued by the State Seed Laboratory that shows the analysis of any such sample is prima facie evidence of the true analysis of the entire lot from which the sample was taken. The presumption established by this subdivision is a presumption affecting the burden of proof, but it does not apply in a criminal action.