Definition
As explained in Colorado's Criminal Code Section 18-12-101, gravity knives are "a blade released from the handle or sheath thereof by the force of gravity or the application of centrifugal force, that when released is locked into place by means of a button, spring, lever, or other device." Additionally, illegal knives are any type of blade over 3 1/2 inches long, that can inflict stabbing, cutting or tearing wounds.
Illegal Weapons
Gravity knives, which include butterfly knives, are classified as illegal weapons in Colorado. Therefore, any individual found to be carrying a butterfly knife is committing a Class 1 misdemeanor, under Colorado's criminal code. This carries a minimum sentence of $500, six months of jail time, or both; the maximum--a $5,000 fine, 18 months in jail, or both.
Concealed Butterfly Knives
Colorado's Criminal Code Section 18-12-105 states that it is a Class 2 misdemeanor if anyone is caught knowingly carrying a butterfly knife that is concealed. The court could give a $250 fine, three months in jail or both; or a more serious sentence of a $1,000 fine, one year in jail, or both. Carrying it as a concealed weapon on any type of school grounds, including a university, raises the misdemeanor to a Class 6, which carries higher fines and longer jail terms.
Previous Offenders
For any individual who is already in trouble with a felony conviction, being found with a butterfly knife adds the crime of "possession of a weapon by a previous offender," according to Colorado state law.
Exceptions
Exceptions that can be argued for carrying a butterfly knife include: 1) using it only as a fishing or hunting knife (sports use); 2) the individual accused of the misdemeanor was a "peace officer or member of the armed forces of the U.S. or Colorado National Guard acting in the lawful discharge of his duties;" 3) the individual had a valid permit or license to carry the butterfly knife.