Liza Long, the author of "I Am Adam Lanza's Mother"--as seen in the documentaries American Tragedy and HBO(R)'s A Dangerous Son--speaks out about mental illness. Like most of the nation, Liza Long spent December 14, 2012, mourning the victims of the Newtown shooting. As the mother of a child with a mental illness, however, she also wondered: "What if my son does that someday?" The emotional response she...