Colo. Rev. Stat. § 38-12-1306
If a landlord fails to comply with this part 13, a tenant may assert the landlord's failure as an affirmative defense for a tenant to an eviction proceeding. If a tenant asserts such an affirmative defense, and the landlord cannot demonstrate by a preponderance of the evidence that the landlord has complied with this part 13, the court shall dismiss the eviction proceeding.
Source: L. 2024: Entire part added, (HB 24-1098), ch. 113, p. 360, § 2, effective April 19.