Switchblade Knife

(an automatic opening knife) This is any folding knife that propels it’s blade out to it’s open-operational position, merely by the push of a button in the handle or the blade is released and drops out by gravity. These are “switch blade knives” and as such are regulated by Federal Law – The Federal Switchblade Act. In MN they are a Felony to carry on your person.
Interestingly, a handicapped person Can carry one under the Federal Law. See the law for specifics.