Part 2 - page 14, the cops have advised her of her rights, and are trying to trip her up. They SAY they are conducting an investigation “trying to find out what happened.” but then they TELL HER no weapon was planted.
It looks like the cover-up has already started at that point.
Part 2, page 28, she says she didn't know they were SWAT, but the interrogator interrupts her, and tries to plant the idea in her mind that she heard them yell “SWAT”. Under terrific stress she responds with the vague “Yeah, I guess.”
Looks like a cover-up, rather than a real investigation.