I've said before that I can see an emergency order much like a mental health safety hold that lasts 48-72 hours during which time a hearing must be held to continue the hold barring possession of firearms. a 30 days extension could be put in place during which time another hearing would be held to determine the longer term status. Diagnosis of any mental illness in and of itself would, in most cases, not be enough to remove a constitutional right so a real threat or a finding of incompetence must be established prior to extended removal of the right to bear arms.
The difference between the two approaches is significant. One does not have due process and would not stand to scrutiny. The other has emergency provisions, due process, and safeguards against abuse.
While I wouldn't be opposed to such an approach, the problem there is that the likely end result isn't really any different than what we have now.
Most doctors and/or even professional counselors/therapists aren't in a position to adequately make this determination for the vast majority of their patients, simply because of the amount of time they typically spend with them. The only people usually in a position to be able to make this determination when it is needed are the family and friends closest to them - the ones that spend time with them every day - and they are usually the ones most blind to what is going on.
There's a reason the lament is almost always "I should have seen what was happening" as opposed to "I saw what was happening and no one would listen to me."
The simple truth is that it may, and I emphasize may, not be possible to put measures in place which adequately prevent people who are about to snap from having access to firearms without violating a lot of people's second amendment rights.
It's similar to why suicide by firearm is not a gun issue for me, whatsoever. Even if you removed all access to firearms, it would have little to no effect on the suicide rate.
I'm all for responsible, sensible, effective legislation that helps to protect lives while not violating people's constitutional rights. I'm just not sure that it's possible.
Part of the perils of living in a fallen world.