It will be packaged in a camouflaged cylinder and either be handheld or mounted on an armored car. Army has already ordered its own prototype of the non-lethal acoustic weapon. "Tear gas lingers long after you've fired off the canisters," said Norris. Norris' narrow ultrasound beam takes care of that problem, meaning police could use it to subdue suspects or quell riots, without hurting bystanders or the operator, because the sound is directional. The problem with past attempts to make an acoustic weapon is that sound traveled in every direction, affecting the operator, as well. Police departments and the Pentagon are flocking to Norris' headquarters in San Diego to see this revolutionary technology for themselves. Had we stayed longer, Norris said our skulls would literally start to vibrate. At 110 decibels, we were forced to walk out of the beam's path, our ears ringing. The operator chooses one of many annoying sounds in the computer - in this case, the high pitched wail of a baby, played backwards - and aims it at us. The acoustic "weapon," in the demonstration model, looks like a huge stereo speaker, except this one sports urban camouflage. It usually doesn't take that much to stop someone, as we learned in a demonstration in the company parking lot. The device emits so-called "sonic bullets" along a narrow, intense beam up to 145 decibels, 50 times the human threshold of pain.
Some people, it will knock them on their knees." " most people," said Norris, "even if they plug their ears, it will produce the equivalent of an instant migraine.
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