C.R.S. § 35-54-101: Bills of sale given for livestock sold.

No person, whether as principal or agent, shall sell or otherwise dispose of any livestock, nor shall any person, whether as principal or agent, buy, purchase, or otherwise receive any such livestock, unless the person so selling or disposing of any such livestock gives, and the person buying, purchasing, or otherwise receiving any such livestock takes, a bill of sale, in writing, of the livestock so sold or disposed of, or so bought, purchased, or otherwise received.