BTW, Thanks for the links

http://www.compoundsecurity.co.uk/teena … ducts.html

" The Mosquito ultrasonic teenage deterrent is the solution to the eternal problem of unwanted gatherings of youths and teenagers in shopping malls, around shops and anywhere else they are causing problems. The presence of these teenagers discourages genuine shoppers and customers’ from coming into your shop, affecting your turnover and profits. Anti social behavior has become the biggest threat to private property over the last decade and there has been no effective deterrent until now.

Acclaimed by the Police forces of many areas of the United Kingdom, the Mosquito ultrasonic teenage deterrent has been described as “the most effective tool in our fight against anti social behaviour” . Shop keepers around the world have purchased the device to move along unwanted gatherings of teenagers and anti social youths. Railway companies have placed the device to discourage youths from spraying graffiti on their trains and the walls of stations. "

http://www.npr.org/templates/story/stor … Id=5434687

retaliation: Teens Turn 'Repeller' into Adult-Proof Ringtone

(Note also that many shops in America, including Old Navy, have been using subliminals in their store music CDs to discourage shop lifting since at least the late '90s. What else is "embedded" in these frequencies?)