Yes, these weapons are being developed, mostly as non-lethal crowd dispersal. Get too close, and your outer layer of skin gets hot. Get back a few feet and it is merely warm.
The best protection isn’t tin foil - it is dressing like a responsible biker, with leather pants, jacket, gloves and non-conductive head covering.
the tin foil is for the nut cases.... weapons development is ongoing on many levels... it is the lunacy of this guy’s claims that I was dissing