C.R.S. § 16-2-112: Arrest followed by a complaint.

If a peace officer makes an arrest without a warrant of a person for a misdemeanor or a petty offense, the arrested person shall be taken without unnecessary delay before the nearest available county or district judge. Thereafter, a complaint shall be filed immediately in the county court having jurisdiction of the offense and a copy thereof given to the defendant at or before the time he is arraigned. The provisions of this section are subject to the right of the arresting authority to release the arrested person pursuant to section 16-3-105.