FILE - In this Dec. 16, 2015 file photo, Dr. Bennet Omalu attends a special screening of "Concussion" in New York. Omalu, a pathologist best known for researching NFL brain injuries, resigned Tuesday, Dec. 5, 2017, from the San Joaquin County coroner's office accusing Sheriff-Coroner Steve Moore of interfering with death investigations to protect law enforcement officers. (Photo by Evan Agostini/Invision/AP, File)
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