Essendon probes claims that fake WADA letter cleared drug ESSENDON, the club at the centre of the drugs-in-sport controversy, may call in police to investigate the origin of a letter purportedly from the World Anti-Doping Agency (WADA), which gave the all-clear to use an anti-obesity drug on its players. The Herald Sun says the letter, presented to the club by sports scientist Stephen Dank, was a dupe. The club told the Herald Sun in an email that it did not give permission to Dank to use the drug. The paper says Essendon believes it may have been tricked into using the drug, and will seek legal advice in a bid to clear its players of doping sanctions.