Shooting to Stun

It sounds like science fiction — a heat ray that can zap rioting protesters, forcing them to flee without inflicting injuries. But the U.S. military's Active Denial System — which shoots a beam of electromagnetic radiation, causing its target to experience a burning sensation — is just the latest attempt to make crowd control more effective yet less lethal. Unlike traditional brute-force methods of dispersal — such as rubber bullets and batons, which can maim or even kill — a new wave of hi-tech crowd-control gadgets promises to keep the peace without causing casualties.

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