Animals and plants can help the police in many fascinating ways. In this talk by TV wildlife producer, film-maker and presenter Nigel Marven, we'll see how flies and wasps gave the exact time of a murder. How diatoms, wood chips and pollen linked villains to the scene of their crime. How dogs are trained to sniff out arson, and we'll meet drug busting pot-bellied pigs and find out how flies trapped a murderer in Ancient China.