Yes. Don't know about those specific cases but I know places where this happens a lot, and especially when it comes to white collar crime, but also mafia-with-a-legit-front kind of affairs.

>This is a conversational dead-end because there is both no evidence for it in this case, and no way to disprove it.

Doesn't that make it a conversational endless road?

Being able to prove or disprove it would make it a dead-end, getting the conversation to stop :-)

This is a conversational dead-end because there is both no evidence for it in this case, and no way to disprove it.