stops a bad guy with a gun. we call bs. they say guns are just tools like knives and are as dangerous as cars. we call bs. >> 17 lives were lost in wednesday's massacre, now the 19-year-old man who has confessed to those killings, to shooting and killing those 17 students and teachers, is now charged with their murders. the shooter's attorney says he is mentally ill. he has depression. he is a broken child. people who know him personally, not as sympathetic, calling him very strange. a former class mate told cnn if there was someone to shoot up a school, it would be him. cnn's senior investigative correspondent drew griffin is in parkland, florida. drew, you have been digging into his past and to his social media postings, and you have talked to people who know this gunman. people who were afraid of him. what have you uncovered?