C.R.S. § 31-10-1103: Challenge to be made by written oath.

Each challenge shall be made by written oath, signed by the challenger under penalty of perjury, setting forth the name of the person challenged and the basis for the challenge. The judges of election shall deliver all challenges and oaths to the clerk at the time the other election papers are returned. The clerk shall forthwith deliver all challenges and oaths to the district attorney for investigation and appropriate action.