The tasing death of Anastasio Hernandez Rojas involving Border Patrol agents is the subject of a new documentary on PBS. The program reveals new footage that shows a crowd of agents surrounding Hernandez Rojas while he lays on the ground. "First Look: Crossing the Line" looks at the alleged use of excessive force by border agents against illegal immigrants.

Watch I think I witnessed someone being murdered' on PBS. See more from Need To Know.