Electro shock is used to control a slave and to erase memory. Stun guns are used daily on some slaves. Slaves are under so much control that they will shock themselves if the master wants them to.
Equipment has been developed to alter states of consciousness electronically, and also to track, and monitor slaves. The most serious development in electronics for mind-control is their ability with high tech equipment to actually place thoughts into a persons mind. Harmonic machines (given code-names) are now being used to do lots of the programming. Powerful individual & mass-mind control can take place via electronic means; our question, who will control the controllers of these electronic means? So far the American & European people have been content to let them get by with what they have done.