Chronic traumatic encephalopathy is confirmed at autopsy by the presence of hyperphosphorylated tau in neurons and has been associated with a clinical syndrome manifested by cognitive decline, behavioral changes, and suicidal ideation.19,20,21,22,31 Of the 21 enforcers who died, 11 died of causes often associated with CTE pathology (2 neurodegenerative disorders, 2 drug overdoses, 3 suicides, and 4 motor vehicle crashes). This evidence concerns the gene MAPT and Mental deterioration.