Rhoads and his work were investigated by the Puerto Rican Attorney General Ramon Quinones, with review of medical aspects by Dr. P. Morales Otero, representative of the Puerto Rico Medical Association, and Dr. E. Garrido Morales, representing the Commissioner of Health. Sworn testimony was taken from several of Rhoads' patients as well as his colleagues, including Castle, William Galbreath, and George C. Payne. They reviewed the case files for the 257 patients treated by Rhoads and the Rockefeller Commission, including the 13 patients who died during this period. They found no evidence of the crimes described in Rhoads' unmailed letter. The Attorney General and medical community joined in absolving Rhoads of the Nationalist charges that he was part of a U.S. plot to exterminate Puerto Ricans. Rhoads was subject to separate investigations ordered by the acting American governor of Puerto Rico, Beverley, and the Rockefeller Institute, and "neither...was able to uncover any evidence that Dr. Rhoads had exterminated any Puerto Ricans."