Everything went smoothly. As I promised, here is what I asked, and what happened:
Which do you place a higher priority on, the safety of the public or the safety of the team?
Lots of waffling from all of the candidates. They had a series of softball questions before they came to me, and then BAM! Eventually, all three said that they would not want to compromise their safety, but, upon amplification, all said they would willingly place themselves in the line of fire to protect an innocent bystander (which is a job and moral requirement).
Would you obey an unlawful order?
A couple said they would request clarification and try the chain of command, but all candidates said that they would not obey an unlawful order, which was the only acceptable answer.
I would like to thank everyone for the input and assistance.