May Day

S6 E22: As the result of a school shooting, Kovac and Benton care for the gunman and his victims. Abby discovers that Carter has been illegally injecting pain relievers. Greene and Weaver confront Carter about his problem, and Weaver orders him to enter a drug rehabilitation center or leave the hospital permanently. Carter refuses but is later approached by Benton, who insists that Carter go to Atlanta for the detox program. Benton accompanies Carter on the flight.