I would like to say but I think the idea is to catch those people who are using marriage for visa. I agree with removing those people so I would not like to be helping them prepare for immigration checks like that.
I will say that when they do, you are not the only one they question.
Mike, me too is sorry to hear what happened to you. I asked "somebody" about your status and if you did everything 100% clean, and if you knew your actual wife a reasonable time in USA; there is no explanation for what they did to you.
So, you can write a very specific letter to the same office, make a copy and ask to sign it, so you have a proof of reading, and your wife can talk to them too,
why she didn't in the first place? They have to fix the whole misconstrue.
it is very nice that you respect the rules, everybody should do it and just for the record... People who make the questioning, are special trained ones. There is not a specific list or whatsoever, there are many different questions, also they read body language signals to find out if somebody is lying and other etc. etc.