Depends on where you get your DUI. As a Civilian, whether Civil Servant or Military Spouse, if you are not on base and get a DUI/DWI in the host country, you are subject to their laws, period. They may choose to hand you over to the Base Commander, at which point (as a spouse) the evidence must be the same as required in the US (as simple as failing a field sobriety test) or of equivelant nature. As a civil servant, you can be subjected to the same UCMJ laws overseas, as you agreed to when you submitted your orders to go overseas or accepted a position overseas.