http://www.silicon.com/publicsector/0,3800010403,39164346,00.htm
Natasha Lomas
"'Warning your activities are being monitored by CCTV - disperse'. CCTV that tells litter louts to bin their rubbish has been pioneered by a council in the North of England, which is claiming "100 per cent success" for the project. Seven CCTV cameras in Middlesbrough have been wired up with speakers in an effort to combat anti-social behaviour in trouble hotspots around the town centre. The speakers, which have been in place since the end of July, allow CCTV operators to intervene when they spot a litter bug or a group of loitering youths behaving suspiciously, by voicing one of several standard phrases - or saying something a little more personal."