Cal. Health & Safety Code § 110490

(a) A laboratory that performs analyses of foods for pesticide chemical residues for other persons shall be accredited pursuant to Article 3 (commencing with Section 100825) of Chapter 4 of Part 1 of Division 101. This subdivision shall not apply to any of the following:
1. (1) A laboratory operated by a government agency.
2. (2) A laboratory not operated for commercial purposes that performs pesticide chemical residue analysis on foods for research or quality control for the internal use of the person initiating the analysis. For purposes of this section, “commercial purposes” means that the laboratory performs pesticide chemical residue analysis on the foods primarily for the purpose of making a profit.
(b) A laboratory accredited pursuant to Section 12591 of the Food and Agricultural Code shall not be required to be accredited under this section until January 1, 1992.
(c) A laboratory that performs analyses of foods for pesticide chemical residues, but that is not required by subdivision (a) to be accredited may apply for accreditation pursuant to Article 3 (commencing with Section 100825) of Chapter 4 of Part 1 of Division 101.
(d) This section shall become operative on January 1, 1991, or 60 days after the initial set of regulations adopted pursuant to Sections 100830 and 100835 becomes effective, whichever is later.