Two people have mentioned to me, in person, that psychiatric records should be available to determine whether or not someone should be able to buy a gun.
This is a very dangerous idea.
If your belief is that mental illness is a reason people commit mass shootings, the. The solution needs to be more and better mental health care. If we start discriminating against people with mental illness we will further stigmatize an already stigmatized disease.
By increasing the stigma around mental illness, you decrease the likelihood someone seeks help. If your belief is that mentally ill people are dangerous, you want them to seek treatment.