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Michael Cowan investigates the consequences for victims of crime and those accused of offences when crucial evidence goes missing or is lost by police forces. He speaks to a man who says he is trying to clear his name but vital evidence has been lost.

Reporter: Michael Cowan\\nProducer: Jim Booth\\nEditor: Nicola Addyman \\nAdditional research: Wil Crisp and Sophie Eastaugh

If you have been affected by sexual abuse or violence, help and support is available via the BBC Action Line. https://www.bbc.co.uk/programmes/articles/22VVM5LPrf3pjYdKqctmMXn/information-and-support-sexual-abuse-and-violence