Martin Kenny (Sligo-Leitrim, Sinn Fein) | Oireachtas source

We have always heard that, when a person drinks alcohol, the level reduces every hour afterwards because alcohol is essentially water soluble whereas many drugs remain in people’s fat cells. At least, that is what I have heard. The witnesses might confirm or deny it. If a person takes drugs at the weekend, those drugs would still be in his or her system three, four or five days later and could be detected.