"Finding a drug odor is called an alert. Most dogs alert by scratching but true to his pit bull nature, Popsicle prefers to indicate narcotic odors by biting or chewing at the location of the smell. If Rudy weren't quick to intervene, Popsicle could rip the source of the suspicious scent to shreds."
From Dogs with Jobs, Season 2 Episode 2 ~6:00
streaming on netflix
Pit bull authority Diane Jessup on the use of pit bulls as police K9s.