Cal. Health and Safety Code § 1293.2

It is a misdemeanor for any person to do any of the following: (a) Willfully prevent, interfere with, or attempt to impede in any way the work of any duly authorized representative of the state department in the lawful enforcement of this chapter. (b) Willfully prevent or attempt to prevent the representative from examining any relevant books or records in the conduct of his or her official duties under this chapter. (c) Willfully prevent or interfere with the representative in the preserving of evidence of any violation of this chapter or of the rules and regulations adopted under this chapter. (d) For purposes of this section, “willfully” means the person doing an act or omitting to do an act, intends the act or omission and knows the relevant circumstances connected therewith.