As a two-time participant in the interview process at KU, I can tell you that yes, there are a lot of ethical questions.
My approach was very straightforward - to always act on the patient's behalf. When given any situation, I would generally determine who the patient was and act as a proponent for them.
Whether or not this is always right (legally or otherwise), at least you've got a stance coming in and you won't sound unsure of how to act in difficult situations. Sure, they may question your answer, but you've got to remember that the fact is - you don't know the right answer - and neither do they.
This is why they ask - they want to see your thinking process and how you may act under duress. I can tell you that the interviews are generally very low stress and the interviewers for me were always very friendly - never condescending.
As for this year - I applied EDP so it may have been different for me, but one of my two interviews was open-file, meaning they had everything (grades, mcats, essays - the whole ap - amcas and secondary).
Just go in, be yourself - you'll do fine.