Just seen a report on a sonic derrerant device, which looks like a normal spot light in shape, but has a speaker mounted in the front. It emits a noise that the under 20s can hear but us oldies can't!!! Rochdale are wacked one up. The idea to keep the chavs out of areas where they can cause trouble I suppose. Are they going to work or are they just pointless? Can't find a link on them at the moment. But still looking. Anyone know anything about htem?