I honestly don't think it would help because people who want guns bad enough will always find a way to get them. For example with the kids from Columbine, when they couldn't purchase their own, they got an older friend to do it. The young man from the most recent shooting used his mothers guns (she had recently took up shooting as a hobby). Not every one who owns and carry guns have permits for them. I can't see how passing a law would change any of that. That is just my opinion though.