There is a device 'The Mosquito' that is going to be used in New Zealand in public places that every New Zealander has a right to access at any time of the day
http://www.nzherald.co.nz/nz/news/article.cfm?c_id=1&objectid=10879766
Main point is that it targets everyone under a certain age regardless of what they are doing
Not to mention the potential health effects
http://en.wikipedia.org/wiki/The_Mosquito
I am over 25 and I can hear the sound. Have a listen for yourself
http://www.teenbuzz.org
If you live in the area where it is going to be deployed please make a complaint with the Human Rights Commission so this device can be banned