>> what happened to precipitate these changes in the united kingdom? >> changes really came about through problems. >> like a national scandal after a series of high-profile false confessions, including an arson/murder case eerily similar to robert davis'. >> the government of the day instigated a review of the way that prisoners were dealt with in custody. >> the result? a complete overhaul of the system. every officer in the uk retrained to rigorous standards that apply in every region of the country. strict rules were put in place for suspect interviews. all interviews in serious cases video-recorded. >> there are two cameras up there. one gives a head and shoulders shot of the interviewee, and the idea behind that is that, if this interview was shown in court, it gives a clear picture of you. the other is a global view of the room. everyone who is in the room is shown in the picture. that's about showing exactly what happened.