I bet the young killer had an IEP.
“In the US, the Individuals with Disabilities Education Improvement Act of 2004 (IDEA) requires public schools to develop an IEP for every student with a disability who is found to meet the federal and state requirements for special education.”
“As outlined by IDEA, students can receive free appropriate education under special education law if they fall under one of 14 categories:
1. Autism
...
4. Developmental delay (for children aged 3–9, varies by state)
5. Emotional and behavioral disorders
...
7. Intellectual disability (formerly referred to as mental retardation)
...
13. Traumatic brain injury
...”
https://en.wikipedia.org/wiki/Individualized_Education_Program
The federal government might require under the IDEA law that the federal gun buyer database be informed of such a plan.
This would enable gun vendors to make better selling decisions.
That Florida shooter looked European, Bosnian was my first impression.