Every place seems a little different on how they approach this, some are very strict, others behave more sensibly. I suppose its a case by case things, as well.
I do have some personal experience with this, sort of. it was back in the early 90s, so things might have changed, since. (this is an anecdote, not data)
Some folks had a visit from a friend they hadn't seen in a few years. Rural area, they did some shooting in the backyard (completely legal). There was an accidental shooting, (non fatal, thankfully). Sherriff had to check it out, and found out the visiting "old friend" was a prohibited person. He went away, because it was a violation of the terms of his release to be around guns. Something he never mentioned to any of the people he was visiting.
Non of them were found at any fault for allowing or "facilitating" his access to firearms. And rightfully so.
Makes me wonder if a prohibited person can enter a home he or she knows, or strongly suspects contains guns.
It seems there can be differing levels of "prohibited person". All are of course prohibited from buying or owning/possessing a gun, but some are also prohibited from being where guns are, while others, apparently, are not. I might be wrong (an if so, please correct me).
Someone who has a parole/probation requirement that they cannot be around guns, I would think the burden would be on them, to determine where they could, and could not legally go.