They studied police reports of street violence from 1995 to 1999 in five randomly chosen towns where CCTV was installed in 1997 - Ashford, Eastbourne, Lincoln, Newport in the Isle of Wight and Peterborough.
Other questions encompassed hydrotherapy for people with progressive conditions, immigration applications, and whether CCTV cameras should be installed in abattoirs to reduce animal cruelty.
This conclusion is based on evidence provided by forensic experts and CCTV footage obtained from a network of surveillance cameras installed by the Karachi district government in sensitive areas of the city.