Behind the Shield Boston police sergeant who bragged about hitting George Floyd protesters with car was previously accused of sexual assault By Dugan Arnett Globe Staff,Updated December 30, 2020, 2:10 p.m. Email to a Friend Boston Police Sergeant Clifton McHale testified in the double murder trial of former New England Patriots tight end Aaron Hernandez in Suffolk Superior Court in July 2017.Pat Greenhouse/Globe Staff The Boston police sergeant mired in recent controversy over video footage showing him bragging about intentionally striking protesters with his vehicle is a veteran supervisor with a troubled, complicated past on the police force, according to two people briefed on the matter.