Duncan Smith (Dublin Fingal, Labour) | Oireachtas source

I have blown into a breathalyser maybe 15 or 16 times in my life but I have not in the past few years. If I go home tonight and run into a checkpoint, a few pass and I am one that is pulled in, am I blowing into a breathalyser and getting drug tested or is at the discretion of the gardaí at that point? This is just a checkpoint. It has nothing to do with-----