Hudson is not a trained trailing hound but we wanted to test him anyways.

From the Guinness Book of world records: Essentially a nose with a dog attached, a trained bloodhound is the first animal whose evidence is legally admissible in some US courts. A typical bloodhound's nose is lined with 230 million scent receptors - around 40 times more than the human nose - which are used in court to match scene-of-crime evidence to criminals. Bloodhounds have been used to trail human scent since Roman times.