Missouri stroke window period expert witnesses assess whether stroke recognition, imaging, and thrombolysis or thrombectomy decisions met time-sensitive standards. They are often vascular neurologists, emergency physicians, neuroradiologists, and EMS medical directors from systems tied to Barnes-Jewish Hospital and Washington University in St. Louis. They evaluate last-known-well documentation, transfer delays, telestroke workflows, and door-to-needle or door-to-groin times.