C.R.S. § 24-1-138
24-1-138. Mandatory donation of services prohibited
24-1-138. Mandatory donation of services prohibited. (1) A regulatory agency or other department, division, agency, branch, instrumentality, or political subdivision of state government shall not require:
(a) A person practicing a regulated profession or occupation to donate the person's professional services without compensation to another person as a condition of admission to or continued licensure, or other authorization to practice the profession or occupation; or
(b) Payment of money in lieu of uncompensated service.
(2) This section shall not be construed to prohibit the crediting of required hours of continuing education in exchange for hours of donated services by a person in a regulated profession or occupation.