Don't chance it. All cruises now you have to complete a pre-cruise registration, the informaton of which is turned over to Homeland Security which in turn sends it on to US Customs and Immigration authorities who meet the ship and provide a list of all felons, past and current. Buzzers go off when you surrender your cruise card during debarkation at the gangway and you are given quite a going over. I should know, I am a convicted felon (guess why ?! LOL) and I've been on 125 cruises.
Get ok from your probation officer in writing, only way to go.
WORLDSPAN
PS Even if not felon, I would not chance it without ok in writing!