A clinical study with 1% of the population would be great if that 1% could actually capture some people that had the disease that they are testing for. I mean, say you're testing the efficacy of a drug on the HIV virus, but the virus is so rare that of the 1% of the population you pick to test the drug, NO ONE HAD the disease. Such a test would be pointless. If the disease in this case is the school shooting, there are some states that hasn't had a school shooting for decades. Picking that 1% to test the usefulness of gun policy wouldn't do much good.
And that's why I want a citation to see how widespread concealed carry in schools really are. We know Utah is pretty liberal in what they allow, but for the other 12 states, we don't know if it's state wide, a few counties, or just 1 city, like in Texas. I'm asking for more information.