i doubt they do a polygraph but they will drug test you and im pretty sure they would do a background check on you also, only job i can think of that they would do polygraph on is maybe in Las Vegas as any worker in a casino but im not even totally sure about that
I don't think their able to if your not an employee but I did hear and this is no joke that one of the questions in your interview was have you ever thought of stealing an armourd truck and if you say no they dont hire you