"... effective security interview involves a series of questions and evaluation of performance across the responses ..."
True.
Add demeanor, body language, appearance to these questions. I think there a lot of non-verbal questions being asked by the person looking at visitors. One of the most useful is the ability to read"body language" and fit. Does this person fit the right pattern? Are they hiding something documentation and other procedures missed? Of course this will get a lot of false positives like the parent post.
Can be. Not saying that's what they are doing in this instance.