Still No Suggestions.. Still Open...

It's been well over 48 hours, and no one, not even the Brady Bunch, has put forth a new gun control idea that would have prevented any "gun free zone" shooting in America's history.

I want to thank Mad Hatter, at the "Left Friendly" Daily Whackjob for repeating the question there.
And Scott the Coffee guy for mentioning it here...

While we both got a fair share of philosophical replies, neither post got a valid answer. The closest call goes to Greg Bouchillon, who echoes my opinion that mental health reporting issues need to be tightened up considerably, but that does not fall into line with what the Brady Bunch insists is needed to stop such violence.

The Brady Campaign is working nonstop to get the message out that there are solutions to gun violence. We can ban military-style assault weapons and high-capacity ammunition clips that make it so easy to kill quickly . . . we can require Brady background checks for all gun sales, including at gun shows . . . we can stop large-volume gun sales that supply illegal gun traffickers. These are just some of the steps we can take to make it harder for the wrong people to get guns.
Brady Campaign Website

So, I'm reposing the question. What does the Brady Campaign offer that would have prevented any mass murder by gun in America's history? Surely there must be at least one?