What kind of paint must one drink to get that delusional?

I believe the colour is “meth”

I hope they turn that police department upside down for not noticing that they had a complete basket case running around with a uniform and a gun.

They won’t, and if he was, say, abusing stimulants, his coworkers probably worried, yeah, but “reporting would mean the end of his career” so they just cover for the abuser until something like this happens. And then pretend they never noticed anything and act shocked and make promises as to how it’ll never happen again, while doing literally nothing about the problem.