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Direct Support Professional training and community placement/living became more prevalent following the Willowbrook State School scandal where it was uncovered following an investigation by then WABC journalist Geraldo Rivera, that residents were being physically mistreated and kept in poor living conditions.
Back at Yale, McCollum and Dr. Saul Krugman performed studies at Willowbrook State School in Staten Island, New York, where they found that a form of hepatitis was spread through blood transfusions and that transmission of serum hepatitis (now known as hepatitis B) could be blocked using gamma globulin.