Microwaving People is Verboten

It's probably a war crime, I would think so. There are reports from different places in the world that 'directed energy' attacks have been made on border guards and spy agents. Directed energy refers to a collimated beam of electromagnetic energy tuned to frequencies which hurt, incapacitate, or potentially even kill the targets. A number of frequencies which land in the wavelength range of microwaves are good for heating up water and thus organic matter. While microwave transmitters have been around for a long time, new advances in electronics and battery energy storage have made such devices strong enough to be used outside of the steel box in one's kitchen and instead on the battlefield. The effects of exposure to microwave directed energy is not well researched and particularly hard to study given that intentional attacks are not something any ethics committee would allow; let alone find volunteers for.