The North Dakota pipeline is causing protests. North Dakota police apparently dont hold back in controlling them!
Apparently drones are now used ! See below.
"Protesters in North Dakota have been pepper sprayed, strip searched, hit with rubber bullets, and kept in dog cages. The fact that the police also have armed drones at their disposal, when the police are already heavily militarized and using force against peaceful protesters, is incredibly troublesome.
Although the law doesn't allow drones to be equipped with lethal weapons, it DOES allow police to affix tear gas, rubber bullets, beanbags, pepper spray and tasers to the drones."
(I should add that the above is quoted from a CARE2 petition to stop the drones being allowed, so may not be unbiased.)