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This week, Laura looks at a 30-year-old cold case that鈥檚 blown wide open thanks to a piece of chewing gum.

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鈥� a piece of chewing gum.

Murder They Wrote with Laura Whitmore and Iain Stirling is available weekly on 大象传媒 Sounds. Subscribe now so you never miss an episode. Email us at lauraandiain@bbc.co.uk.

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