A drone dubbed the “flying guard dog” could cripple crime gangs flooding prisons with weapons and drugs. Two high-security jails were said to have lost control of the air space above them in the latest watchdog report. Chief inspector of prisons Charlie Taylor warned illicit drone drops now posed a “threat to national security”. Basic anti-drone measures such as netting and CCTV had fallen into disrepair, with drug deliveries rife. But the Civil Aviation Authority (CAA) has granted permission