Proving causation in a Maryland negligence claim requires proving that the defendant’s negligent action was both a cause-in-fact on the plaintiff’s damages and a legally cognizable cause. This means that a plaintiff must show that the defendant’s actions were the actual cause and that the actions were sufficiently related and foreseeable. To prove the defendant’s actions were the cause-in-fact or “but-for” cause of the plaintiff’s damages, the defendant’s actions have to be proven to be the actual cause of the harm.
Maryland courts apply the “substantial factor test” when “two or more independent negligent acts bring about an injury.” Under the substantial factor test, the defendant’s conduct must be a substantial factor in bringing about the plaintiff’s damages. Therefore, there can be more than one cause of injury—but the defendant’s conduct has to be a substantial factor in causing the harm.
This theory can be applied in Maryland products liability cases. In asbestos cases, Maryland courts consider whether the plaintiff’s exposure to an asbestos-containing product was a substantial factor in the development of the plaintiff’s injury. Courts generally consider the frequency, proximity, and regularity of a plaintiff’s exposure to a product to determine causation in such cases.
Maryland Accident Law Blog


