[Myth statement] ...making an urban maze with many more smells. [Status] Plausible [Notes] 
Unlike the other runs, Morgan the Bloodhound was confused by the other smells around him. His trainer had to take him back to the start and try again. The dog only found Adam after 90 minutes of wandering around, and had taken a different path than Adam. The reason is that Morgan had not yet been trained to deal with urban tracking. However, some bloodhounds are specifically trained to work in urban environments, and the MythBusters pointed out various recorded instances of scent dogs successfully tracking targets in dense urban areas.