C.R.S. § 31-10-609: Spoiled ballots.

In precincts which use an electronic voting system or paper ballots, no person shall take or remove any ballot from the polling place before the close of the polls. If any voter spoils a ballot, he may successively obtain others, one at a time, not exceeding three in all, upon returning each spoiled one. The spoiled ballots thus returned shall be immediately canceled and shall be preserved and returned to the clerk along with other election records and supplies.