A video taken by Sandra Bland in 2015 shows how a white state trooper confronted the 28-year-old black woman in a traffic stop after he says she failed to signal. Texas authorities have denied withholding the footage shot by Bland, who was found hanged in a jail cell near Houston in 2015. The video had not been publicly seen until it was aired this month by a Dallas TV station. Both lawmakers and Bland’s family say they had never seen the clip