a. Rules for active investigations.

The statute does not differentiate between active and closed investigations. Investigatory records are subject to public inspection unless, in the opinion of the records custodian, their disclosure would be "contrary to the public interest." See Pretash v. City of Leadville, 715 P.2d 1272 (Colo. App. 1985) (inspection of records of active investigations may be denied if disclosure would impair or impede the investigation).