California Code, Business and Professions Code - BPC § 1272.6

The department shall, on or before January 1, 1992, develop or adopt a proficiency testing program for laboratories providing cytology services which may be administered by the department or by a proficiency testing service or program approved by the department. The proficiency program established pursuant to this section shall include announced and unannounced onsite proficiency testing, with that testing to take place, to the extent practicable, under normal working conditions.