esocid writes "Called the SMU 100 it costs £25,000 and sends out a three-meter 'wall of light' that leaves anyone caught in it briefly unable to see. Designed by a former Royal Marine Commando, it was originally developed for use against pirates in Somalia. While tasers and CS gas work well over short distances the laser is said to be effective at up to 500 meters (1,640ft). Being targeted by the beam has been compared to staring into the sun before being forced to turn away. Paul Kerr, managing director of Clyde-based Photonic Security Systems, which came up with the design, said 'If you can't look at something you can't attack it.'"