'A Policeman's lot is not a happy one,' they say, but it's a different Story for the Police Dog - as Peter West finds out at the Metropolitan Police Dog Training Establishment at Keston, Kent.

Tails wag a lot during training-whilst workers like 'Pytch' and 'Leo' - both labradors - show us how effortless it is to find drugs, guns, and explosives which a human being would never detect.