Rav Wilding and Sian Lloyd look at the challenges faced by police in the fight against gun crime.

Sian is live at the National Ballistics Intelligence Service headquarters. From their secret location in the West Midlands, specially trained NABIS officers lead the nationwide battle to solve gun crime.

Plus an in-depth look at the latest weapon in the fight against gun crime - a scanner that detects 3D-printed guns. Show less