In the latest twist in Vijay Singh's case against the PGA Tour, the Tour rebuffed Singh's sweeping discovery requests, including demands for documents and communications related to the "possible or acutal violation of the [Tour's Anti-Doping] Program" of five current professional golfers: Doug Barron, Matt Every, Mark Calcavecchia, Scott Verplank and Dustin Johnson.
- Doug Barron became the first golfer to be suspended under the Tour's anti-doping program in 2009. Barron sued, and the case was settled.
- Matt Every was suspended for "conduct unbecoming a professional" following a 2010 arrest for marijuana possession in Iowa during the John Deere Classic. The charges were later dropped.
- Mark Calcavecchia endorsed deer antler spray until 2011, when he was told by the PGA Tour that the product did not conform to the Tour's anti-doping program.
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