Just want to highlight this section of this article:
"Mr. Cruz’s school disciplinary records show he attended at least six schools, including Cross Creek School, a school for students with emotional problems; Dave Thomas Education Center, an alternative high school for at-risk youth; and an adult education center. He was first identified as developmentally delayed in 2002, when he was 4 years old.
In incidents that began in 2012, when Mr. Cruz was 13, he was disciplined for being disobedient and unruly. In 2013, the records suggest, he was counseled for making a false 911 call.
He was suspended several times in the 2016-17 school year, his last year at Stoneman Douglas, and was frequently reported for prolonged and unexplained absences. In September 2016, he was suspended for two days for fighting, only to return and get suspended again nine days after the fight, this time for hurling profane insults.
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That same month, the Department of Children and Families began its investigation into Mr. Cruz. The investigation, first reported by The Sun-Sentinel of South Florida on Friday, was obtained by The Times on Saturday. The state agency had petitioned a court on Friday to make the confidential records public, but the court has yet to do so.
“Mental health services and supports were in place when this investigation closed,” Mike Carroll, the secretary of the Department of Children and Families, said in a statement. Mr. Cruz was investigated as an adult, and the investigation appeared aimed at determining whether he was being neglected.
Agency investigators identified Mr. Cruz, who had turned 18 a few days earlier, as a “vulnerable adult due to mental illness.” In addition to depression, Mr. Cruz had autism and attention-deficit hyperactivity disorder, the report said. He was regularly taking medication for the A.D.H.D. It was unclear whether he was taking anything for the depression, according to the report.
After the argument with his mother, an investigator visited the family’s home in Parkland, which was clean, clutter-free and did not present any foul odors. The investigator did not see the cuts on Mr. Cruz’s arms: He was wearing long sleeves.
“Mr. Cruz stated that he plans to go out and buy a gun,” the report states. “It is unknown what he is buying the gun for.”
His mother denied that she and her son had argued. She told the investigator that Mr. Cruz did not have a gun, though he did have an air gun she would take away from him when he did not follow rules about shooting only at backyard targets.
His mother, who died in November, told investigators she attributed Mr. Cruz’s behavior to “a breakup with a girl.” Ms. Cruz “stated that she and the girl’s mother told the kids they had to end the relationship because it was unhealthy for everyone,” the report said. Neither the girl nor her mother are named in the report."
https://www.nytimes.com/2018/02/17/us/nikolas-cruz-florida-shooting.html
There is more in the article of interest, due to terms I can't quote more.