Zero tolerance the only way to police drink-driving

IN response to Michael Job (Letters, August 26), I would like to strongly disagree with his claims regarding drink-driving.

He claims that some driver’s can drive impeccably while under the influence of seven drinks, while others may be unfit after a couple of sips.

His logic is inherently flawed and fundamentally unsound. He claims old fashioned tests like walking in a straight line or standing on one foot could be more accurate or effective than the breathalyser.