A ray gun that can stop people in their tracks without harming them may sound like science fiction, but some experts believe it could soon be reality.

The gun is designed to zap its victim with an electric current, using a laser to carry the charge along a beam of ultraviolet light.

The light particles, called photons, would create a path of ions through the air that will be capable of conducting electricity up to a distance of about 100 metres (330 feet).

When the current hits someone, it would interfere with the tiny electrical charges that control the victim's muscles, making movement impossible.

But vital organs like the heart and diaphram would not be affected because they are protected by a greater thickness of body tissue.

seen on BBC
This is what i have saved on my hd. I will check to see if i can find some links.