For those who don’t know, the DOD is nearly ready to deploy its Active Denial System, also known as the “Pain Ray.” The millimeter-wave radiation causes feelings of burning pain (akin to touching a hot stove) in target humans, but when the people leave the beam’s path, the pain immediately ceases, leaving (supposedly) no permanent damage. No one on whom it has been tested has been able to withstand it for more than a few seconds.
The idea is that this is a boon to crowd control (crowd starts to riot, fire the pain ray, everyone screams and runs away). It could also be used to keep people away from sensitive targets (suffuse the perimeter of a nuke plant with pain rays, for instance, so no saboteurs can approach) or even military vehicles (imagine a lower-intensity rotating beam mounted on a Bradley or humvee to keep crowds back).
But here’s the question: Could a person simply cloak themselves in mylar (or aluminum foil, if you’re on a budget) in order to stop the beams and remain in the area? Have the tinfoil-hat types finally been proven right?