California Code, Health and Safety Code - HSC § 11832.13

(a) The department may enter and inspect any building, or portion thereof, that contains an alcohol or other drug program and its records, at a reasonable time, with or without notice, to secure information regarding compliance with, or to prevent a violation of, this chapter or any regulation adopted pursuant to this chapter.

(b) Failure of an alcohol or other drug program to allow the department to enter and inspect the building and records shall result in the department taking legal action to gain entry by an inspection warrant issued pursuant to Title 13 (commencing with Section 1822.50) of Part 3 of the Code of Civil Procedure. The alcohol or other drug program shall pay for all costs associated with legal action required to gain entry.