C.R.S. § 37-48-120

The county commissioners of each county shall have provided at each polling place ballots or ballot labels, or both, ballot boxes or voting machines, or both, instructions, elector’s affidavits, and other material and supplies required for a general election by law. The county commissioners, acting as a group, may procure all of the necessary supplies and may agree among themselves as to a division of the costs therefor. Election officials may require the execution of an affidavit by any person desiring to vote at any election of the district showing evidence of his qualifications as a taxpaying elector, which affidavit shall be prima facie evidence of the facts therein stated.