The Director General of the World Anti Doping Agency was in Dublin this week.
David Howman was at Sport Ireland's 2015 yearly review announcement at The Aviva Stadium.
After tennis player Maria Sharapova failed a drug test for taking meddonium, which up until 2016, was not on the banned list, Howman admits he is concerned that other athletes could be taking 'legal' drugs for performance enhancing reasons.
Sharapova had been taking the drug for ten years for health reasons.
Howman spoke to 98FM's Now That's What I Call Sport presenter Jamie Moore.
You can listen to more from David as well as Dr. Una May from Sport Ireland below.
David discusses cheating in Irish sport, Russia's hopes of proving they are clean ahead of the Olympics and the allegations by the UK Sunday Times last week, that UK based Doctor Mark Bonar doped 150 athletes.
