More:
"A local SWAT officer, stationed in an adjacent building, noticed Crooks sitting below the window where the officer had set up his rifle. The officer found Crooks's presence suspicious and took a photo."
"A witness selling patriotic hats at the rally noticed Crooks in his video footage and alerted the FBI, according to CNN."
"A recently surfaced video shows the earliest known footage of Crooks at the rally, according to CNN."
"Just over 15 minutes after the initial observation, the SWAT officer saw Crooks holding a range finder pointed at the stage where Trump was speaking."
www.cnn.com
Why wasn't anything done?
Because it was a staged assassination event.
Either Maxwell was offered a deal by the Trump administration, freedom/lighter sentence, for her to corroborate the new narrative of there never having been a list.
Or.
She'll soon be found suicided.