Automatic Knives Are Legal To Possess in Most States There used to be a federal ban on automatic knives, but key provisions have been repealed leaving it up to the states. It is legal in 44 US states to own a switchblade knife. Most states allow carry without restriction.The graphic below shows those state where you can own one or many.
Source: www.akti.org This graphic is not meant as legal advice. Check your local laws if your state is without preemption.