2016 Colorado Revised Statutes
Title 16 - Criminal Proceedings
Code of Criminal Procedure
Article 13 - Special Proceedings
Part 3 - Abatement of Public Nuisance
§ 16-13-306. Class 4 public nuisance

If any person carries on or practices any profession or calling or operates any business required to be licensed by the laws of the state of Colorado without first procuring a license therefor, or carries on or practices such profession or calling or operates such business after the license therefor required by the laws of the state of Colorado has been lawfully cancelled or revoked, the carrying on or practicing of such profession or calling, or the operation of such business without a license is a class 4 public nuisance and may be restrained and abated.