In September 2019, a family member told Highland Park police that the man, Robert E. Crimo III, had threatened to kill everyone, Christopher Covelli, a spokesman for the Lake County Major Crime Task Force, said Tuesday. Officers visited Crimos home and confiscated 16 knives, a dagger and a sword, but made no arrest, Covelli said, because they lacked probable cause. However, they notified Illinois State Police, he said.
Just months later, in December, Crimo applied for a firearm owners identification card, the document required to possess a gun in Illinois. Because Crimo was under 21 at the time, state law required him to have the consent of a parent or guardian before he could own a firearm or ammunition. According to state police, which issues the cards, Crimos father sponsored his permit application.
State police had received a clear and present danger report on Crimo after the September incident, but because at that time he did not have a pending application or an active permit, known as a FOID card, the agency ruled there was no action it could take. When reviewing Crimos application less than six months later, state police officials once again decided there was nothing they could do this time, the agency said, because Crimo had a sponsor.
The subject was under 21 and the application was sponsored by the subjects father, Illinois State Police said in a statement. Therefore, at the time of FOID application review in January of 2020, there was insufficient basis to establish a clear and present danger and deny the FOID application.
https://www.washingtonpost.com/nation/2022/07/05/highland-park-parade-shooting-live-updates/