A proposed class of current and former Rohm & Haas employees attempting to bring a medical-monitoring action against the chemical manufacturer has been halted by the Pennsylvania Commonwealth Court.

In ruling on the defense’s preliminary objections this week, the three-judge panel held that though the risk of harm alleged by the named plaintiff, William Brendley, might be compensable by a workers’compensation judge, a class action wasn’t permissible in a workers’ comp proceeding.