Barry Fudge, physiologist and former UK Athletics head of endurance, says Mo Farah's victories were due to meticulous planning, hard work and determination as opposed to "some magical drug or illicit aid". Mo Farah Brought Joy and Late Closing Speed to Distance Running The New York Times Performance enhancing substance was procured from Switzerland for athlete Mo Farah SWI swissinfo.ch Ewan MacKenna: Mo Farah has more questions to answer than gold medals and the facts are stacking up against him : r running Qu'est ce que la L carnitine, le produit test par Alberto Salazar sur ses athltes, dont Mo Farah? Mo Farah Wikipedia