Considering cops carry on badge authority and buy on their badge I doubt there is any such requirement with any Department... although it is possible I suppose.  In fact, most cops I know don't bother getting a permit until they plan on leaving their job so that they can put the pistols they bought on their badge n the permit and keep them.  An interesting tidbit, the State Police had the law changed so they could issue permits to their people instead of through a judge because the judges were isssuing restricted permits to Troopers.  First, I don't believe in restricted permits.  Second, I do believe in the concept of treating all fairly... so part of me smiles at this (even though I'm secretly celebrating equal abuse under the law).  But come on... if a judge won't even trust State Troopers who are arguably the best trained officers in the State, what hope is there for any of us?