Over the past year or so, a series of high-profile positives attributed to environmental contamination have dogged racing's highest-profile trainer, Bob Baffert. Last week, the California Horse Racing Board's Board (CHRB) conducted a hearing into the Dextrorphan positive incurred by the Baffert-trained Merneith (American Pharoah) in July. Connections had attributed the positive to cross-contamination stemming from Merneith's groom, who took DayQuil and NyQuil, both of which contain Dextrorphan. Before that were the positives from Arkansas in May, when the Grade I-winning Gamine (Into Mischief) and Charlatan (Speightstown) subsequently tested positive...