Clint: You should definately tell the gamers that there are prisoners playing in the game. Why? Many, many times I have seen prisoners run scams and cons to cheat/hurt unsuspecting citizens. In the USA jails and prisons routinely stamp outgoing mail "prisoner correspondence" and outgoing telephone calls have a recorded message that the call is coming from a prison. This is to protect the general public. In this case the people to be protected are your paying customers. You don't have to ID the particular person/position just provide a warning.
Routinely, some people will include their phone number in diplomatic correspondence going out to strangers. This , in my not inconsiderable experience, should be sanitized at your end. Prisoners can and do commit crimes while incarcerated and often guide outside accomplices to burglary and rape of unwary citizen correspondents/pen pals/phone buddies.
If you have provided warning your liability for any unfortunate incidents will be reduced or eliminated. Understand that the 'convict code" does not equal British Fairplay.
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