unintentional contamination

Trainer Mike Lauer is now a month past serving what he believes was an unjust 75-day suspension because a Thoroughbred under his care at Horseshoe Indianapolis tested positive last summer for metformin, a drug used to treat diabetes in people. With more 20 million patients taking it, metformin ranks as the nation's third-most-prescribed human medicine, according to the consumer healthcare website Healthgrades. Before Lauer's case made it to an official arbitration hearing, the 72-year-old conditioner with five decades of licensure was able to present enough evidence to the Horseracing Integrity...