micha_

Ask him, what he thinks about pizzagate. What he knows about it. What his judgement is. By that you can at least learn, how a professional (even if he is not telling the truth) is argueing.

crazimal

Have known a couple. Depends on personality and how long out of FBI I think. Likely outcomes: 1) call the local office and give a statement. 2) call x number and ask to speak to sp agent y 3) stay out of it; you got death wish or something? May or may not tell you anecdotes from their career etc as a bonus. Btw if confidential they have zero ties. If they have ties and/or even remember their oath, it ain't exactly confidential if you go into criminal matters. But you could definitely learn some things from such people. They Have knowledge.