This document provides important points for plaintiffs to consider when facing a summary judgment or motion for judgment regarding causation. It discusses that causation is typically decided by a jury, and the standard of review favors the plaintiff. The "substantial factor" test was created to lessen the plaintiff's burden to prove causation. When evidence is unavailable, plaintiffs can argue spoliation of evidence. The document also notes requirements for registering residential rental properties built before 1950 with the Maryland Department of the Environment.