The tide is turning on clenbuterol. Within the past month, regulators and racetracks nationwide have announced new initiatives to quell its abuse. New prohibitions are in the pipeline for the New York State Gaming Commission, the Maryland Racing Commission, Gulfstream Park, Oaklawn Park and an alliance of Mid-Atlantic racetracks. On May 1, the Canadian Pari-Mutuel Agency started banning clenbuterol 28 days out from race day at tracks country-wide. The California Horse Racing Board (CHRB) took action four months before that, enacting a years-in-the making, zero-tolerance clenbuterol clampdown that began New...