Crime fighting dogs

"a human has five million smell cells in their nose, but a German Shepherd or Bloodhound has up to 300 million. They are intelligent and learn quickly. Dogs can be trained on specific scents and for specific activities, and will most often be trained with one handler, who is their best friend, family, and roommate. When trained on specific scents such as explosives and bombs, the dog is trained to identify the presence of the scent."