I used to cut out magazine articles and advertisements from in flight magazines with a large pocket knife in full view of other passengers and the airliner’s crew.  That was decades ago.  Pocket knives are no longer considered a gentleman’s tool; they are weapons subject to detailed criminal laws.

Ask someone who regularly carries a handgun about their home state’s law on open or concealed carry, about the law of a neighboring state, or the law in states where they travel regularly.  They likely know the law fairly well.  Now, ask them about the folding knife hiding behind their exposed pocket clip.  It is likely they either do not know their state’s law on knifes, or if they know something, it is incorrect or incomplete.  LEOs believe (mostly incorrectly) that some Federal or state law exempts them from limitations applicable to ordinary citizens.

Knife laws vary state to state, and can be more complicated than one might suspect. Federal law on domestic or imported automatic-opening (commonly referred to as “switchblade”) knives?  Less likely to be known correctly.   How about fixed knives carried on the belt in a sheath?  Carrying a knife on an Indian reservation?  On Federal land other than the District of Columbia? Blades concealed in belt buckle or otherwise disguised?  Carry based on a concealed weapon/firearm permit/license? In a reciprocity state? When in interstate travel?

So, how to find out what is legal and what isn’t?  Internet resources include knife forums; knife legal rights activist organization; the American Knife & Tool Institute.  State statutes and appellate cases referenced by these sites can usually be found online; so can discussion in lawyers’ blogs.  The applicable laws are way too varied and complex for discussion here.  Generally what you need to analyze is blade type and size, carry mode, opening and closing mechanism.  Learn knife guy lingo.  Definition is everything.  Don’t forget that your AR-15 or other multi-tool may have a blade which may not be considered an ordinary pocket knife.  Note that a law on firearms is not generally applicable to knives, and one on “weapons” may or may not include knives.

My advice:  Determine applicable federal, state, county/city laws, and comply.  LEOs who carry any sort of exotic duty knife in uniform or plain clothes should check their state laws on knives and weapons for a sworn LEO exception.   If there is one, it may limit carrying to when in the performance of official duties.  There are countless knives (that will do your daily chores) that are legal in many, maybe all states.  Measure carefully, as prescribed by state law, and when in doubt, shorter is better. Understand your state’s particular terminology; a knife described as one type by the manufacturer may actually be considered another type under the law.  Don’t flash a clip, it may subject you to a police pat-down and detention in some states.  Don’t display world-class, lightning fast opening skill.

Don’t nonchalantly assume anything, lest you end up like I did once.  Far from home (inside the Parliament of Great Britain) with a mildly unusual pocket knife (Spyderco Terzuola lockback, with partially serrated blade, discontinued, pictured below).  Illegal for several reasons.   Who would have thought, after flying across the Atlantic with the knife in my pocket, to a country where swords and really nasty Jack The Ripper knives were sold? Lucky for me the police guard supervisor knew all about the knife, including how to close it, and relished a chance to play with it:

Clink avoided . . . as a professional courtesy, and due to a lack of interest in my other knife, a larger Applegate Fairbairn.

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About Steven Harris

Steve Harris is an experienced attorney (member of Florida Bar, 1979) who has represented federal agents and local LEOs in duty related matters. He has written and lectured about officer involved shootings, self-defense, and use of force law, including "Stand Your Ground." Steve has been a seasoned and active competitive handgun shooter for over 20 years.

7 thoughts on “NICE KNIFE . . . BUT IS IT LEGAL?

  1. Excellent write up. I drive through 3 counties and roughly 5 cities daily to and from work. I have decided to leave the pocket knives home and carry something a little more tool bag’ish’.

    • Thanks. As you note, county and even city ordinances can affect the legality of concealed or open knife carry — unless there is state law preemption on knives.

  2. Nice write up. I have to remind myself that we live in a world where not everyone thinks the same way about things. Whereas I see a knife as a tool, others see it as a weapon. Whereas I see a switchblade as something that makes a blade easier to open, others see it as a weapon. A “weapon,” to me, is something in the hand of an attacker. That “something” could be a rock or broken beer bottle. A rock or a broken beer bottle, in the hands of a determined attacker, can be used to kill me just as dead as a gun or a knife. The people who make these laws don’t think this way. If you own a switchblade, you must be up to no good. I own a truck with 500 hp, so that makes me a drag racer on the weekends. It doesn’t matter if I actually DO drag race. Just because I COULD drag race makes me a drag racer in the eyes of the people who write the kind of legislation that bans switchblades and other tools that COULD be used as a weapon.

    • Joe K, thanks.
      Here is the direct link to the knife chart which covers states and subdivisions, I have not checked on its accuracy, or for any updates:

      Note that cities/counties may have ordinances which limit the carrying of a knife to certain public events or elsewhere, sometimes to places where a gun can lawfully be carried by a person with a state issued firearms permit/license.

      Another interesting issue: I have heard from federal agents who have been hassled about carrying a knife on a commercial flight, even though they are cleared to carry a firearm.

  3. Great article. My Rocky Mountain state’s law is completely vague. I asked a former County Prosecutor about carrying folding (and automatic) knives and he basically told me that he and others used the knife statute as an add-on charge. His advise was that if I was not stupid while carrying a knife, I would be OK. I have very mixed feelings about that advise.

    • Thanks for commenting. Your observations are a good example of what made me write on the subject.

      BTW, I think the folding knife size limit in Colorado is 3.5 inches, maybe does not apply if you have a concealed gun permit; an automatic knife is likely illegal. Maybe more than just an “add on” charge, but something that could alter the effect of another legal provision. For example, simple trespass versus armed criminal trespass.

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