In part three of a series, Bob Woodruff watches a drug seizure at the U.S.-Mexico border, speaks with a convicted drug dealer and one sheriff who is fighting to keep people like him off the streets. ABC News Live Prime, Weekdays at 7EST & 9EST WATCH the ABC News Live Stream Here: https://www.youtube.com/watch?v=w_Ma8oQLmSM SUBSCRIBE to ABC NEWS: https://bit.ly/2vZb6yP Watch More on http://abcnews.go.com/ LIKE ABC News on FACEBOOK https://www.facebook.com/abcnews FOLLOW ABC News on TWITTER: https://twitter.com/abc #Fentanyl #Poisoned #DrugSeizure #ABCNLPrime