The LLT Lab’s MedMal Corpus is one product of the Lab’s Medical Malpractice Project. The semantic data consist of annotated judicial decisions within a sample of medical malpractice decisions selected from the U.S. federal courts. These cases are filed under the Federal Tort Claims Act, and involve claims for medical malpractice in (for example) federal hospitals and clinics, as well as certain federally supported health centers. Using such decisions has several advantages, including the application of state substantive law and written fact-finding decisions (FTCA cases are bench trials, without a jury). The Lab annotates spans of text within these decisions for the semantic roles played in legal reasoning and argumentation.