The Criminal Mind
In the final week of the series, Martin Sixsmith starts by investigating the criminal mind and how psychology is used in the police and justice system.
He interviews one of Britain's leading forensic profilers Julian Boon about the early days of profiling, from Jack the Ripper in Victorian London to the capture of 'Mad Bomber' George Metesky in1940s New York.
He looks at criminal responsibility and witness suggestibility and he asks about the place of modern neuroscience in ensuring a fair trial.
Produced by Sara Parker
A Falling Tree production for BBC Radio 4.