Hello,
In my opinion, this would be great and bring some wonderful RP to the server. Crafty should 100% take lead in this department as he definitely fits the role and has the dedication for this.
Realistically though, this is a good suggestion but the issues I see is the RP, well, lack of it on the server for it specifically the people who enjoy a firefight over RP such as traffic stops which are basically just a shootout stop (flashback to a previous suggestion/discussion).
Another issue would be the whole design of the ranking and roles etc would need to be looked at and whether it would fall directly under PD and as a sub-department rather than a whole new department etc.
Many thanks,