Colo. Rev. Stat. § 16-2.5-102
The following peace officers shall meet all the standards imposed by law on a peace officer and shall be certified by the peace officers standards and training board, referred to in this article as the "P.O.S.T. board": A chief of police; a police officer; a sheriff; an undersheriff; a deputy sheriff; a Colorado state patrol officer; a town marshal; a deputy town marshal; a reserve police officer; a reserve deputy sheriff; a reserve deputy town marshal; a police officer or reserve police officer employed by a state institution of higher education; a Colorado wildlife officer; a Colorado parks and recreation officer; a Colorado police administrator or police officer employed by the Colorado mental health institute at Pueblo; an attorney general criminal investigator; a community parole officer; a public transit officer; a municipal court marshal; and the department of corrections inspector general.
C.R.S. § 16-2.5-102