Supreme Court questions Massachusetts' stun gun ban

Superficially, this is about stun guns, but the point made in the ruling is that the right to bare arms extends to devices other than firearms.

It would be hard to read this ruling, and Alitos comments and not think it would equally apply to knives well.

http://www.usatoday.com/story/news/2016/03/21/supreme-court-stun-gun-second-amendment/76313848/

"While stun guns were not in existence at the end of the 18th century, the same is true for the weapons most commonly used today for self-defense, namely, revolvers and semiautomatic pistols... If the fundamental right of self-defense does not protect Caetano, then the safety of all Americans is left to the mercy of state authorities who may be more concerned about disarming the people than about keeping them safe."