37. The Chewing Gum Cold Case

This week, Laura looks at how a 30-year-old cold case was solved thanks to some impressive detective work, a few exciting advances in DNA technology, and… a piece of chewing gum. Murder They Wrote with Laura Whitmore and Iain Stirling is available weekly on BBC Sounds. Subscribe now so you never miss an episode. Email us at lauraandiain@bbc.co.uk.Details of help and support with addiction are available at bbc.co.uk/actionline.