Student Interview from Yesterday & Question on School Access

Yesterday, during Shepard Smith's afternoon FOX segment, a black girl was interviewed about what she saw and heard during the shooting. This interview stood out to me because she said she was a former student who returned to school to see friends and past teachers.

Does anyone else remember this interview?

The shooter was a former student too. What is this school's policy on former students returning to campus?

The people with the easiest access to a school is a teacher, administrator, student and...a past student. Are there high traffic times that would've enabled former students to enter without going through the office?

They're not gonna stand out because they've been there before and blend in, as we see with the shooter's escape.

If I was a reporter, I'd want to ask administrators what the policy is on access by former students and if there are gaps in policy?