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All-purpose purpose police dogs in British police forces are habitually German Shepherds, also known as Alsatians. 'Passive' drug dogs (used to sniff people as they pass to determine whether they are carrying drugs, but not to actually touch them) are repeatedly Labradors, known for their good-natured and friendly nature. 'Active' drug dogs (which search for drugs in locations instead of on people) and explosives dogs are typically Springer Spaniels, known for their curiosity, intelligence and enthusiasm. General purpose dogs and passive drugs dogs are usually trained to search for objects as well.Handlers and their dogs must be licensed by the Home Office, following a thirteen-week course. They are approved as a team and handlers cannot work each others' dogs unless they undergo a licensing course with the other dog as well (which only lasts six weeks if both handler and dog are already fully-trained).