Hi, first of all,why did he apply for a visa in the first place,driving convictions would never stop you getting in the US. This is a real hard one to answer,it seems your partner does not have enough ties here for them to issue a visa,and they think he might not return home. I would say there is a real chance that people who are refused a visa are put on the computer,so as to stop them from trying to use the visa waiver system,but i cant be sure,i will ask next time i pick up a member of staff from the embassy,im sorry i cant be of more help,but i wouldent want to say go ahead and go and he got turned back.
NORMAN