Some schools already have metal detectors.
How would a metal detector at Sandy Hook have stopped that guy, unless there were also armored doors, adequate to stop a determined assault for long enough to allow armed deterrent to arrive, that only allowed one person through at a time?
We got a war on drugs right ?
Use the existing database on the dangerous drugs to monitor those who are taking the psychiatric drugs too. We have controlled substances, break through the HIPPA laws so the bureaucrats track the unstable minds as in those on these drugs.
It’s not the guns, it’s not the metal detectors, IT IS THE MINDS, unstable minds.