An attorney told the Pennsylvania Supreme Court on Wednesday that applying the full weight of the Fair Share Act required juries to apportion damages in all products liability cases, but several justices said they were worried doing so would open the door to “speculation” and “junk science” in the courtroom.

A full complement of the court heard arguments Wednesday in the asbestos case Roverano v. John Crane, a closely watched case that is expected to provide guidance to courts and litigators on how to apply the Fair Share Act in strict liability cases. Much of the argument session focused on whether damages should be apportioned equally to all defendants or whether juries should determine damages based on each defendant’s conduct.