For many citizens the macabre fascination with terrorism ends when trials are held and the bad guys are sent to jail. But is that the end of the threat? Borealis talks with former UK prison governor Ian Acheson on what happens after the barred doors are closed.Ian Acheson spent a quarter century in prison security and counter-terrorism. He also ran the UK government’s counter-terrorism strategy, CONTEST, in Southwest England. He currently works as a senior adviser to the US-based Counte...