I tested a table-top demonstration model, but here’s how it works in the field.

A square transmitter as big as a plasma TV screen is mounted on the back of a Jeep.

When turned on, it emits an invisible, focused beam of radiation – similar to the microwaves in a domestic cooker – that are tuned to a precise frequency to stimulate human nerve endings.

It can throw a wave of agony nearly half a mile.

Because the beam penetrates skin only to a depth of 1/64th of an inch, it cannot, says Raytheon, cause visible, permanent injury.

But anyone in the beam’s path will feel, over their entire body, the agonising sensation I’ve just felt on my fingertip. The prospect doesn’t bear thinking about.
“I have been in front of the full-sized system and, believe me, you just run. You don’t have time to think about it – you just run,” says George Svitak, a Raytheon executive.

Silent Guardian is supposed to be the 21st century equivalent of tear gas or water cannon – a way of getting crowds to disperse quickly and with minimum harm. Its potential is obvious.

In tests, even the most hardened Marines flee after a few seconds of exposure. It just isn’t possible to tough it out.

This machine has the ability to inflict limitless, unbearable pain.

By MICHAEL HANLON, Dailymail, UK

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Seems all the rage in Columbia, Dial up a murder maybe ?