Guadalupe Munoz Elizondo

Since the launch of the Horseracing Integrity and Safety Act's (HISA) drug testing program over a year ago, metformin has sucked up an awful lot of oxygen. Under HISA, there have been seven resolved cases and four pending cases involving metformin—perhaps not an especially large number on its own, until framed against the number of metformin cases adjudicated before the program went into effect. An Association of Racing Commissioners International's (ARCI) review of their database "going back decades" found five metformin cases for Thoroughbreds. All were from 2017 onwards. The...

In a statement Thursday, the Horseracing Integrity and Welfare Unit (HIWU)--the enforcement arm of the Horseracing Integrity and Safety Act (HISA)--said that an internal review of the six accredited laboratories used by the agency had unearthed different limits of detection in blood for metformin, a banned substance at all times under HISA. "Following this review, which was conducted in collaboration with the laboratories, it was determined that not all applied the same Limit of Detection in analyzing samples for the presence of Metformin. HIWU has since met with all six...