A dead man's switch is a type of implant that knocks its owner unconscious when activated. When set off with a specially prepared, deliberately focused EMP bomb, it knocks the wearer out and erases recent memories. It is not healthy for the wearer, and often doesn't work as well as it should. It has a unique requirement that the victim needs to feel like they died at the time of the memory wipe. Otherwise, the risk of irreversible psychosis rises steeply.