It wasn’t even close or far: unanimous court decision. 8-0 vote.
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. Revolvers were virtually unknown until well into the 19th century, and semiautomatic pistols were not invented until near the end of that century. Electronic stun guns are no more exempt from the Second Amendment’s protections, simply because they were unknown to the First Congress, than electronic communications are exempt from the First Amendment, or electronic imaging devices are exempt from the Fourth Amendment.
You can read (and I urge you to do so) starting in page 15. It is a careful dissection of the stupidity of the lame meme used by Gun Control, Gun Sense and “Gun Safety” fanatics. The closing alone is worth the price of admission.
A State’s most basic responsibility is to keep its people safe. The Commonwealth of Massachusetts was either unable or unwilling to do what was necessary to protect Jaime Caetano, so she was forced to protect herself. To make matters worse, the Commonwealth chose to deploy its prosecutorial resources to prosecute and convict her of a criminal offense for arming herself with a nonlethal weapon that may well have saved her life. The Supreme Judicial Court then affirmed her conviction on the flimsiest of grounds. This Court’s grudging per curiam now sends the case back to that same court. And the consequences for Caetano may prove more tragic still, as her conviction likely bars her from ever bearing arms for selfdefense. See Pet. for Cert. 14. 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.
There you go.