I understand that the Irish Courts system is based on the UK's. In which case, he pleaded guilty only the brief facts need to be given. In the UK no witnesses would be called the facts would be given by the Crown Prosecuter. In which case the endless paper work as outlined by Av8boy is all unnessesary.
Its not lightly that he would be prosecuted again in the US for the same offence, double jepody is not a TV game show!