Cal. Food and Agricultural Code - FAC § 12591. Section 12591.
The director may accredit a commercial laboratory to test produce or environmental samples, including air, water, soil, and plant or animal tissue for regulatory pesticide residue purposes if the director finds all of the following conditions:
(a)
That the department laboratories cannot handle required testing in a timely manner or that the use of a commercial laboratory is more cost-effective to the department or a segment of agriculture.
(b)
That the laboratory agrees to and participates in a quality control oversight program as specified by the director.
(c)
That the laboratory’s control and analytical protocols meet criteria established by the director.
(d)
That, as part of the quality control oversight program, the director may conduct unannounced onsite inspections of the laboratory during normal business hours.