Must agree with Riga above. In general, if the helicopter flight does not reed/require the pilot/crew then that type of flying will be UAV in the future.
Example: looking at a pipeline – UAV; actually fixing the pipeline – helicopter.
Regarding police units; how often do police pilots land their helicopter and get out and do “police stuff”. I think the answer results in increased UAV police flying in the future. An EC145 is an expensive way to just to have a look.