Okla. Stat. tit. 47, § 47-153: Driving of unmarked automobiles prohibited - Exception

It shall be unlawful for any person to drive any state-owned or

-leased automobile at any time and for any purpose, on any street or

highway within this state, unless the provisions of Section 151 of

this title have been strictly complied with, provided, however, the

Commissioner of the Department of Public Safety is hereby authorized

to set aside automobiles for use by the Department so that the same

may be available to the Department without identifying marks

thereon. These vehicles shall not be used for traffic enforcement

on a routine basis.