The K9 Unit turns an ordinary traffic citation into a major smuggling bust.
The Nogales PD K9 Unit discovers a new smuggling technique: the air cannon.
K9 Unit officers scour the desert to stop weapon smuggling.
The Nogales PD K9 Unit disrupts a human trafficking network.
A high-speed chase results in a death-defying roadside arrest.
Citizens, fellow law enforcement and reformed criminals help the K9 Unit.