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Mexico has one of the highest murder rates in the world - nearly 60 people died violently every day this year. And someone has to go to the crime scene and clean up afterwards. That man is often Donovan Tavera. He set himself up as Mexico's first forensic cleaner - his fascination with cleaning up blood began when he witnessed a traumatic event as a boy (Picture: Bénédicte Desrus / Alamy)