One month after it became legal for use in training but not for race-day, the bronchodilator clenbuterol continues to pose concerns for horsemen and regulators.

Previously illegal in the United States but legal in Canada and Australia before it was approved by the federal Food and Drug Administration on May 11, clenbuterol is marketed under the trade name Ventipulmin syrup. The presence of the drug in post-race tests can result in disqualification, forfeiture of purse, and/or suspensions.

The New Jersey Racing Commission has suspended Thoroughbred trainers J. D. Conner and Robert Jacobs (see below) for one year each after horses under their care tested positive for the prohibited bronchodilator clenbuterol.

In addition, one other clenbuterol case involving a Thoroughbred is under investigation and four Standardbred trainers have also been suspended for one year as a result of clenbuterol positives