The other day on Glenn Greenwald's blog, bystander cited Digby who remarked about a nasty crowd control device that has been documented by the BBC recently. That led to track down more about the two systems referred to in the article, the Active Denial System, and the Silent Guardian. It turns out that the relationship between these two is that Active Denial System is the U.S. military's requested, and largely implemented weapon for something in between crowd control and counterinsurgency, and that Silent Guardian is Raytheon's implementation of the main weapon, a collimated 1 millimeter (95GHz) beam 45 inches square, and has a range of 250 meters.
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