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Legally you would be breaking your probation if it states you specifically cannot leave the county. First you will definitely be detained when entering back into the United States. I imagine that could take upwards of 24 hours where you'll be locked in a detention cell at the port of entry. As long as you haven't violated the conditions of probation you should have no problems getting back into the country after a delay. But here's a suggestion:
Go to your PO and tell him/her what you want to do. Ask for permission in writing. Then when you cross you give your passport, your written travel permit, and your PO's card with cell number on it and hopefully you're tied up for 20-30 minutes while they verify instead of who knows how long while they're investigating your whole criminal history.
If you are presently under formal probation and crossed into Mexico to see a relative and you did not advise your probation officer of your intent to cross the border beforehand, very likely you have violated the terms of your probation. Whether or not you did is best answered from reading carefully the terms of your probation in the the probation report and resulting order control the terms and conditions of your probation.
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Coming back into the country they CAN, leaving the country into Mexico probably not. They will most likely check your criminal background and could see that you are on probation. Is it worth the risk? We are not told the relationship between customs and the criminal court/probation office. They may want to look further into any conviction and see you are on probation and then notify your officer to see if you were authorized to leave the country. It CAN happen but I cannot tell you for sure.
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