Colorado Revised Statutes Title 18. Criminal Code § 18-4-513. Criminal use of a noxious substance

(1) Any person who deposits on the land or in the building or vehicle of another, without the other person's consent, any stink bomb or device, irritant, or offensive-smelling substance with the intent to interfere with another's use or enjoyment of the land, building, or vehicle commits a civil infraction.

(2) It shall be an affirmative defense that a peace officer in the performance of his duties reasonably used a noxious substance.