I had a census worker knock on my door for the 1990 census. He was a little disheveled and was smoking (I’ve never smoked). He identified himself and asked if he could come in. I stepped out onto the porch and told him “I can answer your questions here.” I didn’t feel threatened but wondered about the basic rules and guidelines for these guys.

Are some ex-cons? Maybe.
Are some a threat to us? Possibly.
Has the congressman embellished the numbers? Hmmm.