I am Sarah and in my book, Columbine, the author composes numerous interviews with victims, police, and familys of deceased. Dave Cullen, the author, read many police reports and other documents about this event in order to write Columbine. He tells many different sides of the story and even goes into detail about the mind state of Eric and Dylan. An example of this is in chapter 17 when it talks about the 5,000 interviews the poilce did over a 6 month period.