NBC's Kate Snow Re; Sexual abuse of foreign xchange students

Every year, 25,000 teenagers from around the world come to the U.S. as part of the high school foreign exchange program. In a “Rock Center” investigation, Kate Snow reports on charges that dozens of students were sexually abused by host parents. Did the State Department and companies administering the program do enough to stop it? Rock Center with Brian Williams airs March 14th @ 10pm (eastern)