Lots of nonsense posted here, but it made me wonder about my city's helicopter use.

Calgary has two. Between 2008-2012, they responded to 12,137 calls, resulting in 1840 arrests with 3895 criminal charges. There were 192 vehicle pursuits (ground pursuit not permitted because of the danger to the public).
The 'copters provide a quick response to life-threatening incidents, and support ground units with surveilance and quick response.

Good helicopters are expensive and require both a pilot and patrolman, both costly.

Drones could take some of these tasks, possibly at much less cost to the city coffers.