Legal Blade Length and....

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Here is an excerpt with the Knife related areas highlighted:

Title 18 Criminal Code; Article 12 Offenses Relating to Firearms and Weapons         

18-12-101. Definitions - peace officer affirmative defense.

(1) As used in this article, unless the context otherwise requires:

(a) "Adult" means any person eighteen years of age or older.

(a.3) "Ballistic knife" means any knife that has a blade which is forcefully projected from the handle by means of a spring-loaded device or explosive charge.

(a.5) "Blackjack" includes any billy, sand club, sandbag, or other hand-operated striking weapon consisting, at the striking end, of an encased piece of lead or other heavy substance and, at the handle end, a strap or springy shaft which increases the force of impact.

(b) "Bomb" means any explosive or incendiary device or molotov cocktail as defined in section 9-7-103, C.R.S., or any chemical device which causes or can cause an explosion, which is not specifically designed for lawful and legitimate use in the hands of its possessor.

(c) "Firearm silencer" means any instrument, attachment, weapon, or appliance for causing the firing of any gun, revolver, pistol, or other firearm to be silent or intended to lessen or muffle the noise of the firing of any such weapon.

(d) "Gas gun" means a device designed for projecting gas-filled projectiles which release their contents after having been projected from the device and includes projectiles designed for use in such a device.

(e) "Gravity knife" means any knife that has a blade released from the handle or sheath thereof by the force of gravity or the application of centrifugal force.

(e.5) "Handgun" means a pistol, revolver, or other firearm of any description, loaded or unloaded, from which any shot, bullet, or other missile can be discharged, the length of the barrel of which, not including any revolving, detachable, or magazine breech, does not exceed twelve inches.

(e.7) "Juvenile" means any person under the age of eighteen years.

(f) "Knife" means any dagger, dirk, knife, or stiletto with a blade over three and one-half inches in length, or any other dangerous instrument capable of inflicting cutting, stabbing, or tearing wounds, but does not include a hunting or fishing knife carried for sports use. The issue that a knife is a hunting or fishing knife must be raised as an affirmative defense.

(g) "Machine gun" means any firearm, whatever its size and usual designation, that shoots automatically more than one shot, without manual reloading, by a single function of the trigger.

(h) "Short rifle" means a rifle having a barrel less than sixteen inches long or an overall length of less than twenty-six inches.

(i) "Short shotgun" means a shotgun having a barrel or barrels less than eighteen inches long or an overall length of less than twenty-six inches.

(i.5) "Stun gun" means a device capable of temporarily immobilizing a person by the infliction of an electrical charge.

(j) "Switchblade knife" means any knife, the blade of which opens automatically by hand pressure applied to a button, spring, or other device in its handle.

(2) It shall be an affirmative defense to any provision of this article that the act was committed by a peace officer in the lawful discharge of his duties.

18-12-105. Unlawfully carrying a concealed weapon - unlawful possession of weapons.

(1) A person commits a class 2 misdemeanor if such person knowingly and unlawfully:

(a) Carries a knife concealed on or about his or her person; or

(b) Carries a firearm concealed on or about his or her person; or

(c) Without legal authority, carries, brings, or has in such person's possession a firearm or any explosive, incendiary, or other dangerous device on the property of or within any building in which the chambers, galleries, or offices of the general assembly, or either house thereof, are located, or in which a legislative hearing or meeting is being or is to be conducted, or in which the official office of any member, officer, or employee of the general assembly is located.

(d) (Deleted by amendment, L. 93, p. 964, § 1, effective July 1, 1993.)

(2) It shall not be an offense if the defendant was:

(a) A person in his or her own dwelling or place of business or on property owned or under his or her control at the time of the act of carrying; or

(b) A person in a private automobile or other private means of conveyance who carries a weapon for lawful protection of such person's or another's person or property while traveling; or

(c) A person who, at the time of carrying a concealed weapon, held a valid written permit to carry a concealed weapon issued pursuant to section 18-12-105.1, as it existed prior to its repeal, or, if the weapon involved was a handgun, held a valid permit to carry a concealed handgun or a temporary emergency permit issued pursuant to part 2 of this article; except that it shall be an offense under this section if the person was carrying a concealed handgun in violation of the provisions of section 18-12-214; or

(d) A peace officer, as described in section 16-2.5-101, C.R.S., when carrying a weapon in conformance with the policy of the employing agency as provided in section 16-2.5-101 (2), C.R.S.; or