Jason Owens, the retiring chief, said he hopes future leaders remain impartial and keep politics out of the agency.

According to the union, the behavior seen in the video was a corrective technique taught at the Border Patrol's canine training academy: "The incident in question involves a canine handler ...

Narrator: From the Border Patrol Academy's six-month basic-training program. Daniel Harris: From day one, our goal is to make sure that they are prepared to handle anything that they may encounter ...