A government surveillance video obtained by ABC News has shed new light on a tragic incident at the U.S.-Mexico border, sparking outrage from members of Congress who help oversee U.S. Customs and Border Protection.The video shows that in 2013 two U.S. Customs and Border Protection officers appeared to encourage, or at least permit, a 16-year-old Mexican high school student to drink from a bottle that tests would later reveal contained concentrated liquid methamphetamine.The young man, Cruz Velazquez, died within two hours of drinking the substance, but the two officers involved, Valerie Baird and Adrian Perallon, remain on the job today, with no disciplinary action taken against them.