Psych evaluations can create problems for some vets returning from combat zones who may have sought help for post-traumatic stress disorder symptoms. If a psychological screening reveals a history of PTSD, the candidate may not get hired. The police hiring process, specifically the mental health screening, doesn't allow much leeway for the varying degrees of mental health issues.
Departments hire contract psychologists to screen police officer candidates and the police recruiters may not even know what criteria are used to evaluate the candidate. The psychologist simply says, "qualified" or "not qualified." The problem is compounded when different departments in a geographic area use the same group of psychologists.
Psychological testing is a necessary screening process for police officers, as nobody wants an officer on the streets who is suffering from PTSD. But you have to look deeper into the issue of PTSD and the combat vet as it is understood in society today.
It is important to understand that not every veteran returning home from military service has PTSD. Some studies suggest that it affects between 10% and 20% of veterans returning from active duty.
And the unfortunate fact is that PTSD is getting a lot of attention in society today. Some of it deserved and some of it overstated. PTSD has become the darling diagnosis for anyone having issues ranging from anxiety to suicidal thoughts. What is lost is that there are varying degrees of mental health issues classified as PTSD, and it's not a permanent condition for most people.