02-17-2006, 10:45 AM
Quote:As a form of revenge against disruptive youth, it is almost too sweet - a device that annoys teenagers so intensely they have to disperse and loiter somewhere else.
Police have given their backing to a gadget that sends out an ultra high-pitched noise that can be heard only by those under 20 and is so distressing it forces them to clutch their ears in discomfort..
But because the body's natural ability to detect some frequency wave bands diminishes almost entirely after 20, adults are completely immune to the sounds.
The Sonic Teenager Deterrent, nicknamed the Mosquito because of its sound, has proved so successful in warding off gangs from trouble-spots that it has been endorsed by the police and local authorities...
full article: http://telegraph.co.uk/news/main.jhtml?x...oise16.xml
