Obviously the recent London riots shocked the world, and governments are likely to be researching ways to either prevent the same thing from happening again, or to reduce the effect if it does happen.
The answer could be this - the Active Denial System, which is a method of crowd control that works by firing high-frequency electromagnetic radiation at the crowd, causing intense pain to be felt by those in the firing line. This would cause the group to disperse, and reduce the damage caused.
The Active Denial System is also relatively harmless, with a low probability of injury.
Are heat rays the future of policing? Discuss.
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