Agent Jesus Enrique Diaz Jr., a husband and father with seven years on the job, tortured a 16-year-old drug smuggler two years ago by wrenching his handcuffed arms upward as he pressed a knee into his back. In an effort to make the boy reveal where he had hidden marijuana bundles near the Rio Grande, Diaz also kicked him and dropped him face-first on the ground, agents testified.

No one stopped the alleged assault as the 110-pound juvenile screamed, but some agents talked afterward about the "disgust" they felt and reported it. "I knew that what he was doing was wrong," Agent Gabriel Lerma testified.