Only in extraordinary cases where immigration status can’t be proven. If your document is suspect it’s examined. You can provide additional documents and interviewed about how you obtained your status.

If you are a US citizen they can call your county that holds the birth certificate, take affidavits from parents or other family members.

I mean the fact we haven’t heard of any US citizens detained for months (as you put it) is a good indication it’s not happening because you know the media would blast that story to the top for weeks.