C.R.S. § 1-9-202

Each challenge must be made by written oath on a form provided by an election judge. The form must include a space for the name of the person challenged and the specific factual basis for the challenge of the person’s right to vote as set forth in section 1-9-201 (1)(a) and must be signed by the challenger under penalty of perjury in the second degree, as specified in section 1-13-104 . The election judges shall forthwith deliver all challenges to the designated election official. No oral challenge is permitted.