California Code, Health and Safety Code - HSC § 44004

(a) The motor vehicle inspection program provided by this chapter, when implemented in a district, shall supersede and replace any other program for motor vehicle emission inspection in the district.

However, this chapter shall not apply to any vehicle permanently located on an island in the Pacific Ocean located 20 miles or more from the mainland coast.

(b) The motor vehicle inspection program provided by this chapter shall be in accordance with Sections 4000.1, 4000.2, and 4000.3 of the Vehicle Code.