Paul Daly (Fianna Fail) | Oireachtas source

Going back to the last time and the discussion about blood, urine and hair, my recollection of our previous engagement is that hair is the best sample in that it will even tell you if there were drugs, historically, that would not show in blood or urine. It is similar with human beings. If you watch crime dramas in America, a hair sample can show how long somebody is clean. I believe it is similar with horses.