Expert Witness S02E02 - Mystery of the Playground Shooter and Signature of a Killer

A young schoolboy is mysteriously shot in the head while playing in the school yard, but who fired the gun and from where? Philip Boyce, a forensic ballistics expert, is called in to test-fire a number of different guns and reconstruct the injuries to find out who fired the gun.

A successful murder investigation isn't always just about finding out who committed the crime. Police and prosecutors often have to prove the how and the why. When the body of a woman is found in a river in Wiltshire, the police turn to an expert in an unusual forensic discipline to help solve the crime. Paul Bagnall's expertise in forensic handwriting identification helps prove intent and premeditation and decode the killer's motives.