Gardai have been told that if their beards resemble “a badly watered lawn in a heatwave” after two weeks’ growth, they should "concede graciously and admit defeat".
Hairy-faced cops have been told to “smarten up” and make a decision one way or the other if they want to have beards or not.
The crackdown on grooming rule breaches comes after a change in policy last July, when Commissioner Drew Harris made a decision to let cops sport facial hair other than moustaches.