The shooter at the Madden 19 tournament in Jacksonville was from Maryland, and he used a handgun.
The Baltimore Sun reports that the shooter had a history of psychiatric problems that include hospitalization.
All handguns legally sold in Maryland since 1 October, 2013, have been registered with the Maryland State Police. This includes private transfers which must be run through a licensed dealer in order to create a paperwork trail for a background check.
Part of the MSP background check includes the purchaser’s mental health history. A release form for the check is part of the paperwork submitted to the MSP.
The Gentle Reader may draw what conclusions he will from these facts.