Raytheon Company in the US recently made public a new 'heat' weapon for use in the 'battlefield' (any kind of enforcement), called the 'Silent Guardian', it directs an 'energy beam' (hahaha love that loose term usage) in the form of heat.
For the people over the hill getting zapped by it, its like being exposed to an oven.
http://www.raytheon.com/products/silent_guardian/
Edit: I think lynx was referring to this