Cops go through training and mental evaluations. Thats all we should require. Annual gun safety classes, and a clean mental record/criminal record.
The problem is they really don't.
They pass the psych test 1 time to become LEO. There's not additional evaluations 3 years, 5 years, 10 years, 15, 20. Even after a critical incident there's no re-evaluation to make sure they're mentally or emotionally stable enough to continue working in the best manner, just a screening to which they deem fit for one to go back on the streets.
They some departments have bi annual testing for shooting others have just annual. 3 targets, 5 shots. That's it.
Unless your swat certified, which most aren't.