If a police officer can't function being exposed to OC then yes, they shouldn't be a cop. And it's worth finding out before they are on the street.
They were trained properly and worked through it so they didn't need to be fired. I know of some that had to repeat the exposure and the fight because they broke down on the initial exposure. The second time around they knew what to do and they succeeded. I'd hate for that first exposure to have been during a bad fight on the street.
That sounds like a hiring and retention issue, nothing to do with whether they can work through OC or were trained properly.
OC doesn't cause permanent and serious damage like a bullet does. We do a drill simulating your leg being shot in the academy. We submerge their leg in a big rubber boot filled with ice water. It imobilizes their leg and causes a lot of distraction. They have to maintain their composure in the gun fight that's simulated with simunition. They have to not only return fire but get themselves and a wounded comrade to cover with their leg being useless and in a lot of pain.
You can simulate injuries but you can't simulate OC exposure. Especially since OC exposure won't cause permanent damage, a bullet will.
A nightstick to the shin will not incapacitate you. It may break your leg but you can still move and still fight. We simulate these types of injuries in defensive tactics though. Breaking their legs for real is not an option but simulating injuries is. You can't simulate OC exposure and it doesn't cause that kind of damage anyway.
So can quibbling and "what if" scenarios.
The OC training I went through was helpful when I was exposed to it on the street. The better prepared we can make our recruits, the better we serve them when the shit hits the fan. We do prepare them for serious injuries, along with OC exposure.

