So when did they label him as suspicious? There was a report that said that the distance finder was caught in the checkout but they couldn’t stop him from coming in because it wasn’t considered contraband but he was labeled as suspicious.
But then, the story has been changing all along so who knows what really happened.
When they saw him alright the checkpoint with the distance runner then walk away, they thought that was suspicious, and radioed an alert, but lost track of him in the crowd.