But education teaches you to try to understand why things are so, instead of just accepting that they are so, and the longer you spend there, the more you internalize it. There was a guy in Connecticut who was rejected because his IQ was too high because they thought that would make him less likely to want to do the same thing every day (which seems like or speak for the same, to me).

I think the rest of the comment section has the right idea that after six months of training, the potential police officer needs to be 21, either due to local laws or actuarial calculations from the department’s insurer (which they’d probably describe as internal policy).