In courtroom dramas on television, it is common to see a party keep a witness in their back pocket, only to present the witness to testify on the day of trial. However, in real Maryland personal injury cases, this sort of “trial by ambush” is not permitted under the state’s evidentiary rules. In fact, under Maryland Rule 2-402(g)(1)(A), a party must generally make their expert witnesses available for deposition or interrogatory in advance of trial.
In a recent case, a state appellate court affirmed this long-held prohibition against trials by ambush when it precluded a plaintiff’s expert witness from testifying regarding an opinion he formed only on the day of trial. According to the court’s opinion, the case involved a 2014 car accident between the plaintiff and the defendant. The defendant acknowledged that he was at fault for causing the accident, and the only issue at trial was the appropriate amount of damages.
Evidently, the plaintiff suffered a pre-existing injury in 2010. In pre-trial discovery, it was clear that the plaintiff’s expert medical witness reviewed the plaintiff’s MRI from 2014, but not from 2010. The defendant’s expert, however, examined both the 2010 and 2014 MRIs. During opening statements, the defendant argued that the plaintiff’s expert did not have all the information necessary to back his conclusion regarding the extent of the plaintiff’s injuries.