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We are raiding the Guardian long read archives to bring you some classic pieces from years past, with new introductions from the authors. This week, from 2022: forensic scientist Angela Gallop has helped to crack many of the UK’s most notorious murder cases. But today she fears the whole field – and justice itself – is at risk By Imogen West-Knights. Read by Lucy Scott. Help support our independent journalism at theguardian.com/longreadpod