[Antoninus]

How about these facts:

What meds was he on?
Did he have any prior record?
Was he on anyone’s watch list?
He was obviously a mental case. How did he obtain the guns?

[hanamizu]

“Did he have any prior record?”

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If he just turned 18, it is likely we’ll never know. Juvenile records are sealed. The ‘gentle giant’ of Ferguson, MO had a juvenile record, but it has never been revealed.