State bans on weapons such as butterfly knives, pictured, and billy clubs are under new legal scrutiny as U.S. judges weigh a 2022 U.S. Supreme Court ruling that radically shifted 2nd Amendment ...

Owning butterfly knives are legal across most of the U.S., though restrictions vary. In some states, such as Oregon and Utah, it is legal to own these knives, but illegal to conceal them.