Missouri maintains permissive pocket knife laws, distinguishing “ordinary pocketknives” (folding blades ≤4 inches) as largely unrestricted for concealed or open carry. Other knives face location-specific limits but no statewide bans or blade length caps.
Defining Ordinary Pocketknives
Under Mo. Rev. Stat. § 571.010(12), an ordinary pocketknife has a folding blade no longer than four inches, excluding it from “knife” definitions in weapons statutes. These are legal to own, buy, open carry, or conceal statewide without permits.
Carry Rules for All Knives
Open carry of any legal knife (switchblades, autos, fixed blades >4 inches) is broadly allowed absent local bans. Concealed carry of non-pocketknives risks misdemeanor charges under § 571.030 in restricted spots like schools or vehicles if “lethal weapons,” though concealed carry permit holders often exempt. No general concealed ban exists post-2012 reforms.
Prohibited Locations
Knives bar from schools, courthouses, churches, airports, polling places, and alcohol-serving venues under § 571.107—pocketknives included if deemed weapons. Private property owners dictate rules; vehicles count as “concealed” if not visible.
No Restricted Knife Types
Switchblades, balisongs, daggers, and autos are legal to own and carry openly. Federal interstate transport limits apply, but intrastate use faces no categorical bans. Intent to harm, not possession, triggers unlawful use charges.
Local Ordinances and Minors
No statewide preemption; cities like St. Louis may add rules, so verify locally. No age-specific knife restrictions for minors, though parental liability applies.
Penalties and Best Practices
Unlawful carry: Class B misdemeanor (up to 6 months jail, $1,000 fine); escalates with intent or harm. Measure blades accurately, avoid restricted areas, and carry openly if unsure. CCW permits expand options; consult attorneys for gray areas.
SOURCES :
- https://www.akti.org/state-knife-laws/missouri/
- https://www.couteaux-morta.com/en/missouri-knife-laws/
