Really, you need to talk to an immigration attorney...however, you should not have any problem. just make sure that you have complied with and completed all of your probation obligations.
Of course, every DUI case is different and you should consult an experienced DUI defense attorney in your area with questions regarding your specific case. It is always in your best interest to have a good DUI attorney represent you when you have been arrested for a DUI.
Unless you have a term of probation that says you cannot leave the country and you are not subject to the Interstate Compact (this can restrict travel) then you should not have any issues traveling internationally.
You should not get stopped at the airport leaving. However, you will get picked up if you return to the states, since it doesn't sound like you are taking care of the terms of your probation. Good luck to you.
There isn't any problem leaving or coming - as long as you are in compliance with your probation terms. If you're not, a warrant will be issued for you and you are likely to be stopped and arrested upon reentry.
The above answer is for general information only and is based on the information you posted. Every case is fact dependent, so to get a thorough analysis of your situation, you will need to consult face to face with an attorney licensed to practice in the jurisdiction where the incident took place. Do not conclusively rely on any information posted online when deciding what to do about your case.
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