Electromagnetic fields can be potentially hazardous to human health. The US military may exploit this fact as they study possibilities for new non-lethal weapons. Radio frequency/microwave (RF/MW) emitting systems are already in usage for anti-electronic weaponry, but now devices that release RF/MW radiation are reportedly being studied for "stunning/immobilizing the enemy." Read more at Secrecy News(1).

1. http://www.fas.org/blog/secrecy/2006/04/radio_frequency_bioeffects_vie.html