Colo. Rev. Stat. § 22-63-402
No order or warrant for the disbursement of school district moneys shall be drawn in favor of any person for services as a teacher, except for services performed for a local college district or in an adult education program, unless the person holds a valid teacher's license or authorization from the department of education. Such license or authorization shall be duly registered in the administrative office of the school district wherein the services are to be rendered. A teacher shall hold a valid license or authorization during all periods of employment by a school district. A person who performs services as a teacher without possessing a valid teacher's license or authorization shall forfeit all claim to compensation out of school district moneys for the time during which services are performed without the license or authorization.
C.R.S. § 22-63-402
This section is similar to former § 22-63-104 as it existed prior to 1990.