mikesd81 points out a Times Online article that discusses the legality of the Mosquito sound device, which is used to annoy and drive off younger people with sounds that are too high-pitched for most adults to hear. We discussed how annoying this device can be a couple years ago. From Times Online: "Sir Albert Aynsley-Green, the Children's Commissioner for England appointed to represent the views of the country's 11 million children, has set up a campaign — called Buzz Off — that is calling for the Mosquito to be banned on grounds that it infringes the rights of young people. 'These devices are indiscriminate and target all children and young people, including babies, regardless of whether they are behaving or misbehaving,' Sir Al told the BBC. 'The use of measures such as these are simply demonizing children and young people, creating a dangerous and widening divide between the young and the old.'"