And that's a bit hard to pin down -- at least beyond a few general principles.Sam1911 said:...But really what's being asked isn't is it illegal, exactly, but how is this specific situation likely to be enforced/interpreted....
I've seen federal "felon in possession" convictions upheld when the defendant didn't necessarily have the gun in his hands but had read access to it. And I've cited a case in which a federal appellate court let stand an aiding and abetting indictment against a cohabitant who merely failed to secure her gun.
So perhaps the best we can do, at least as far as federal law goes, is suggest that the gun owner needs to do everything reasonably possible to prevent the prohibited cohabitant from getting his/her hand on the gun. So anytime the gun owner does not have the gun on his/her person, the gun should be locked in a case or safe to which the prohibited cohabitant does not have, or have access to, the key or combination.
And that might not be absolutely foolproof. Among other things, state law might set more stringent standards or a prohibited person on probation or parole might be subject to greater limitations under the terms of his/her probation or parole.