Police have unveiled their latest fearsome weapon in the fight against crime - Britain's first Staffordshire bull terrier sniffer dog. Former rescue dog Kos, a black and white Staffie, was saved from an uncertain fate in a rescue centre to become the first of his breed to be trained to detect drugs, currency and firearms. He was transformed by Avon and Somerset Police dog handler PC Lee Webb after being donated to the force by an RSPCA rescue centre 18 months ago. And his new career got off to a flying start when he found a lump of heroin in a car which was pulled over in Bristol on his first day.