Newfie on the Patch - Funny Newfoundland Joke

Two newfies are in a car enjoying a bottle of black horse, when a cop pulls them over. The newfie in the passenger seat says "He's got us now by, what are we gonna do?"
The driver says they have nothing to worry about and tells him to follow his lead and say nothing.
The driver peals the lable off the bottle of beer, licks the back of it, sticks it to his forehead, and puts the bottle under his seat--the passenger follows suit. The police officer approaches the drivers window and asks for his licence and registration.
As the driver gives the officer his info the officer asks whether he or the passenger had been drinking at all that night, at which point the driver points to his forehead and responds, "Oh no sir, we's on da patch ya see!".