The government have just come out a few years ago with a new micro bot that can take over any human brain and make them complete slave to do their bidding at will and leaves no trace or memories affects. It is injected into the blood stream by a larger micro bot like a bug bite or by breathing it into your lungs like as small as pollen. No repellent or anti pollen drug can help you. They do however select their targets by the background checking to whom might have a past that can at times look normal by the behavior that best fits the targets selected. Large or earth magnets or a large shock like a stun gun can cause them to malfunction or so it is rumored...