evidence: 1-Background checks on all firearm purchases (guns and ammunition) in gun stores, gun shows, private sales and online with a 10 day waiting period. [...] HOW TO PREVENT GUN DEATHS- WHERE THE EXPERTS AND THE PUBLIC AGREE- A POLL The most popular measures in our survey — policies like universal background checks and keeping guns from convicted stalkers — were supported by more than 85 percent of registered voters. Even the least popular idea, a law that would limit gun sales to people who had to demonstrate a "genuine need" for the weapon, was favored by nearly 50 percent. https://www.nytimes.com/interactive/2017/01/10/upshot/How-to-Prevent-Gun-Deaths-The-Views-of-Experts-and-the-Public.html?smid=fb-share&_r=0 [...] The rule, which was finalized in December 2016, added people receiving Social Security checks for mental illnesses and people deemed unfit to handle their own financial affairs to the national background check database, which would have added about 75,000 names to that database. President Barack Obama recommended the now-nullified regulation in a 2013 memo following the mass shooting at Sandy Hook Elementary School, which left 20 first graders and six others dead. The measure sought to block some people with severe mental health problems from buying guns. The original rule was hotly contested by gun rights advocates who said it infringed on Americans’ Second Amendment rights. Gun control advocates, however, praised the rule for curbing the availability of firearms to those who may not use them with the right intentions.