My question involves civil rights in the State of: AZ

So I am interested in general discussion and theory about these interactions. Anyone up for some discussion? I've been through the BP checkpoints on the highways several times and always refuse to answer any questions.

My question here is what happens when the Officer requests/demands movement to secondary? I usually use the "Am I being detained or am I free to go?" line. Does a citizen have the right to refuse going to secondary? There is no probable cause for the Officer to send to secondary, only the fact that you are not submitting to their authority.

My other question is about the difference between a police and border patrol officer. I know that you must comply with demands by a Peace Officer (police), but BP are not classified as a Peace Officer. So if a BP agent asks me to step out of the car, is it mandatory?

Thoughts?