You can disable drones with EMP gadgets, and also with Dr. Xu's default EMP augment.
However, in one of my campaign playthroughs, I noticed that a Shock Trap that had been triggered on a door by a guard also seemed to disable a nearby drone as well.
Is it really possible to disable drones with other gadgets that have a "shock" effect? What about other gadgets and augments that KO guards, such as the HoloCircuit Overloader augment, which has a "shock" animation to it?