Productive and Non-Infringing Restrictions of Second Amendment Right to Have a GunHalf the murderers, half the murder victims, half the suicides are legally drunk. The most prevention of gun violence would come from restricting access to guns to people with evidence of alcoholism. Such evidence would include convictions for drunk driving, public intoxication, and alcohol induced liver disease.
Paranoid people kill 10% of murder victims around the world, or around 2000 people a year in the US. That number includes almost all rampage killings. It is in the nature of paranoia to not believe there is anything wrong with oneself. So even people doing well in treatment will try to stop treatment, and will relapse.
In the absence of drug induced paranoia, marijuana is associated with lower rates of violent crime. So, its use should not exclude people from their gun rights.
None of these policies are in place. They have the potential to cut the overall murder and suicide rates by two thirds, without infringing on the Second Amendment. They would withstand the strictest of scrutiny. There are no racial differences in the risks of mental illness.