"black river." in "black river," draper details his plans for a massacre at pocatello high school. he had even set a date for the attack. two weeks to the day after cassie jo stoddart was killed. >> there's no doubt in my mind that they would have followed through with the bloodiest school shooting in history. >> documenting horrific crimes this way is unusual. but not unprecedented. >> and one boy with multiple gunshot wounds. >> i saw the man with the weapons inside the school. >> now there were two of them. >> yes, they were stalking around. i would assume looking for people to kill. >> in 1999, dylan klebold and eric harris gunned down 12 of their classmates at columbine high school. clinical psychologist dwayne fuselier was the fbi's lead columbine investigator. >> when i first saw the videotape that adamcik and