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Police in the future may be armed with energy beams that inflict a burning sensation on skin without causing permanent damage, or even painlessly and temporarily immobilize a rioting demonstrator. Waves of sound and light could disorient mobs, and sticky foam could trap them like flies on a strip.
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The Village Voice: Tech Wars in Meat Space by Erik Baard
Protest Goes ‘Star Trek’ With Nonlethal Weapons
http://www.villagevoice.com/issues/0131/baard.php