Drone tech today is pretty amazing. Not sure sure how a taser would work if the perp had a bullet proof vest on, but how about one that shoots bear spray? They shoot out a window or bust out the door, then send in a drone with a camera and hose down the perp in the face. The controller could see if the perp is blinded or confused by the bear spray and then one or two go officers go through the door and engage.
“Yes, but he’ll shoot at it.”
Ok, send in two, from different angles. Why not?
Because by the time you do all of this, he has already killed all he is going to kill.
The idea of police drones that take out anyone the government does not like, is a bad idea.