A 1984 Harvard study of over 30,000 patient records found that over 3.7% of hospitalized patients experienced adverse medical events, with over a quarter due to negligence. Close to 14% of adverse events were fatal and 2.6% resulted in severe disability. When extrapolated to the state of New York that year, about 13,450 people died and 2,250 were seriously injured due to medical errors. Verifying a medical practitioner's license can help minimize negligence and malpractice by confirming their qualifications and checking for any disciplinary actions or restrictions on their license. Licensing boards in each state dictate the requirements to legally practice medicine and conditions to remain in good standing. Peer referencing is also an important part of license verification to