Police dogs have become a vital part of the police force. They are well trained, obedient dogs that, unlike humans, do not fear the daily challenges that arise on the job. Police units throughout the world use K-9 units. They are employed by most local police forces and by many governmental agencies. Police dogs can search 400 to 500 packages in a half an hour. They can search a car every minute. This speed saves time, when a human searcher could only do about one car every twenty minutes. Also, according to Canada Customs, in one year, 1993, ....