C.R.S. § 16-19-115

The arrest of a person may be lawfully made also by any peace officer or a private person without a warrant upon reasonable information that the accused stands charged in the courts of a state with a crime punishable by death or imprisonment for a term exceeding one year. When so arrested the accused must be taken before a judge with all practicable speed, and complaint must be made against him under oath setting forth the ground for arrest as in section 16-19-114 ; and thereafter his answer shall be heard as if he had been arrested on a warrant.