Its also really easy to yank the battery out if you need to. The battery also only lasts an hour and a half, tops, and depending what attachments are on it the weight and power draw will shorten that. They will only be useful in quick scenarios like breaching buildings in a raid. Range from the controller isnt very far either without wifi connection, you have to follow it around in unconnected locations.

People tend to imagine strapping a gun to it but really its a scouting tool. Open a door (awkwardly) walk in and look around. Then people follow in and do the work.