“Trooper Miguel Avila was aboard the Department of Public Safety (DPS) chopper as it participated in the pursuit of the pickup. DPS said Avila believed the truck, whose bed was covered with a cloth, was carrying drugs, and that he opened fire to disable it because the fleeing vehicle was headed toward a school zone. (The shooting took place on an unpaved rural road.) The truck crashed after being fired upon. Police found no drugs, but instead found nine Guatemalan immigrants and a teenage driver. Six of the Guatemalans were in the bed of the pickup covered by a cloth. Two of them, Marco Antonio Castro and Jose Leonardo Coj Cumar, were fatally wounded by Avila’s gunfire.”
http://stopthedrugwar.org/chronicle/2013/sep/11/texas_trooper_cleared_chopper_dr