The traffic police flag down a…

The traffic police flag down a car for driving erratically and ask the driver, a young girl, to step out of the car and take a breathalyser test. As they look at the results, the policeman
turns to the girl and remarks severely, ?You?ve had a few stiff ones tonight, Miss.?
?Oh my goodness,? she exclaims blushing. ?I didn?t know it told you that as well.?