>like, I get that off duty cops can moonlight as security,
>that makes sense.
>
>but being able to wear their uniforms while off duty and
>working for someone other than the city? is that normal?

I believe that they aren't allowed to "moonlight" on their own as security or hold any other part-time job, they can only do dept approved secondary work on the side.

I don't know all the details why but I think it goes back to when STL was a heavy mob town.