Okla. Stat. tit. 40, § 40-142.12: Work of technician by noncertified person

After September 1, 1991, it shall be unlawful for any person to

perform the work or offer, by advertisement or otherwise, to perform

the work of an alternative fuels equipment technician until such

person has qualified and is certified as an alternative fuels

equipment technician. Beginning September 1, 1995, it shall be

unlawful for any person to perform work or offer, by advertisement

or otherwise, to perform the work of an alternative fuels

compression technician until such person has qualified and is

certified as an alternative fuels compression technician. Beginning

November 1, 1998, it shall be unlawful for any person to perform the

work or offer, by advertisement or otherwise, to perform the work of

an electric vehicle technician until such person has qualified and

is certified as an electric vehicle technician. Electric vehicles

that have a manufacturer's warranty shall be serviced by an

authorized new car dealer. Any vehicle manufacturer's training

center located in the state, which offers alternative fuel and

electric vehicle courses meeting new car manufacturing requirements,

shall be exempted from this act. Provided, nothing in the

Alternative Fuels Technician Certification Act shall be construed to

prohibit a noncertified person from converting the engine of a farm

tractor, as defined in Section 1-118 of Title 47 of the Oklahoma

Statutes, to an engine fueled by alternative fuels, as long as such

farm tractor is not operated on the roads and highways of this

state.