including a massacre saying i want to shoot people with my ar-15. i want to die killing a ton of people. a former teacher said faculty received an e-mail in late 2016 prompting them to be on the lookout for cruz and let them know if he was seen with a backpack. describe the e-mail? >> it was simple. if he comes on campus with a backpack, let us know. >> reporter: recommending in january, 2017, a threat assessment be conducted to determine if cruz was a danger to the school. the document issued after he was involved in an assault. cnn cannot confirm the authenticity of the document. it's not clear if the assessment was done and broward school has not commented. police records show 39 calls to the shooter's home over the past seven years for various reasons, including reports of, quote, mentally ill person.