After his death, Dronett's brain was tested at Boston University School of Medicine's Center for the Study of Traumatic Encephalopathy. Scientists determined that Dronett suffered from chronic traumatic encephalopathy, a brain disease associated with repeated head trauma. According to the co-director of the Center, Dr. Robert Stern, linemen are estimated to hit their heads about 1,000 times in each season they play. While those hits may not result in concussions, the repetitive lesser brain injuries are likely associated with the disease.