Colo. Rev. Stat. § 37-41-126
Except with respect to claims coming within the provisions of article 10 of title 24, C.R.S., no claims shall be paid by the district treasurer until the same shall have been allowed by the board, and only upon warrants signed by the president and countersigned by the secretary, which warrants shall state the date authorized by the board and for what purposes. If the district treasurer has insufficient funds on hand to pay such warrant when presented for payment, he shall endorse thereon "not paid for want of funds, this warrant draws interest from date at six percent per annum", and endorse thereon the date when so presented, over his signature, and from the time of such presentation until paid such warrant shall draw interest at the rate of six percent per annum; but when there is the sum of one hundred dollars or more in the hands of the treasurer, it shall be applied upon said warrant. All claims against the district shall be verified the same as required in the case of claims filed against counties in this state, and the secretary of the district is hereby authorized to administer oaths to the parties verifying said claims the same as the county clerk and recorder or notary public might do. The district treasurer shall keep a register in which he shall enter each warrant presented for payment, showing the date and amount of such warrant, to whom payable, the date of the presentation for payment, the date of payment, and the amount paid in redemption thereof, and all warrants shall be paid in the order of their presentation for payment to the district treasurer. All warrants shall be drawn payable to the claimant or bearer, the same as county warrants.
C.R.S. § 37-41-126