Until society can better identify potential mass murderers, we need to greatly tighten up AR-15-type rifle regulations. For example, requiring a social media review of the Highland Park shooter would have revealed his recent depictions of mass murder. In 2019, police came to his home because he “was going to kill everyone.” Requiring a local police department OK could have prevented his purchase of an AR-15-type rapid-fire rifle. We have a growing database profiling these mass shooters. If our lawmakers need additional ideas, they can look at Germany’s gun regulations.