Should active police officers be required a mandantory psychological exam. every 12 months?

It takes a certain type of person to be a police officer. They must possess qualities not found in ordinary citizens. Taking verbal abuse is just one example. The ability to act under extreme stressful situations, is an other example. Since most police officers will not readily volunteer to an annual psycholigal examination, would making these exams A Federal Mandantory Law, maybe help to reduce or eliminate suspected excessive force claims against the police? I, personally believe this is a great idea. See and moving a dead decomposed body(espeically a child) takes a heavy toll on police officers. Having an annual psychological exam. would give officers a time to vent their frustrations. Question: should mandantory police psychological examinations be given to active police officers?