Todd,

I would suggest a tiered system. Roughly like this.

1. See a mental health professionsal. 1 point

2. On psychoactive drugs. 1 point

3. Hit the threat meter of a mental health professional. 1-3 points

Points of 3 or more get you noticed and inspected by LEO. 5 points, you hit the list and it takes a lot of work to get removed from the list.

All medical records are moving online/cloud, tracking is already in place for some items. Tracked by mental health professionals.

Nothing is 100% perfect, and it is and it will be impossible to keep firearms out of the hands of someone determined to get one. It is a start, though, and it tramples on the rights of a lot fewer people.