I assume they can back positive to drug.
You can object to the court considering the results because of contamination.
I suggest you hire an attorney
Good luck with that.
If your urine is clean then you've got nothing to worry about, and if it's not then the overwhelming odds are that 1) you're not taking your probation seriously, 2) you're attempting to game the system and 3) you're going down.
If you have a +++ U/A then hire counsel, especially if independent testing proves that you are in fact clean.
Wishing you luck and hoping that I have been helpful in answering your question.
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