Okla. Stat. tit. 47, § 11-1012
In counties with a population over five hundred thousand (500,000) according to the last decennial census, marked and unmarked law enforcement vehicles or any vehicle which a law enforcement officer is using in an official capacity shall be exempt from paying a parking meter while parked on a city street.
Laws 2002, SB 842, c. 381, § 4, emerg. eff. July 1, 2002.