Criminal Law Questions? Ask a Criminal Lawyer.
"We let anyone in". Who is "We"? Are you referring to Ireland? I didn't realize until too late that I had asked a question to a lawyer from Ireland. So I don't expect you to know every law about the US. You seem to assume that he can get a passport. But a little research on the Internet would have told you that not all felons can acquire a passport. It depends on the terms of release.
Thank you for your advice to check with the Consulate of the country that he wants to visit.
My name isXXXXX'm a licensed attorney (United States). Glad to try and help out.
The Legal Expert previously assisting you, whom I see you have opted out from further participation in answering this question, is entirely correct. I think there may be a misunderstanding, but I can attest that he is indeed a United States Legal Expert appropriately answering in this category. He is not in Ireland. This is a United States Criminal Law forum, and our screen shows your jurisdiction list as Florida. What he told you is completely accurate. Such a person you've described, who has successfully completed the terms of his sentencing conditions, will face no prohibition whatsoever to re-entering the United States.
If you have a follow-up question or need clarification, please just say the word by using "reply" to reach me.
I truly hope all works out for you.