What is a “LifeGuard?
The DKL LifeGuard devices were supposed to be able to detect a human heartbeat, by special filtering of the dielectric potential from the human heartbeat, and this filtering was supposed to be good enough to discriminate, at a distance, and through objects, a live human from a dead human, a live ape, or a live dog. Sounds good, doesn’t it? And though there is indeed theoretical justification for trying to do this, the engineering obstacles are impressive indeed. I was initially very excited when I heard about the LifeGuard. Yes, there are theoretical reasons to suspect one could actually detect the “signature” of a human hearbeat at a distance. However, this as soon as you see one, the DKL LifeGuard immediately strains ones’ credulity. They said that the tiny, tiny dielectric force from the heart is supposed to be amplified inside the device, and then to make the device actually swivel on its bearings when you hold it balanced on its handle. Somehow this tiny, tiny dielectric force was
