Everyone should have a right to a fresh start in the eyes of the community, without everything they have worked for being lost. It should be in the person's right to tell you their history, not for you to find it out yourself.
If you need anyone's past history for scam related reasons, that service is offered to you, otherwise, as said, it's none of your business.
As this has bean suggested before the answer was, like last times that privacy of the user is sacred.