You have received a good answer already. It would also be wise for your to consider consulting and or retaining an attorney. Depending on the facts, you may be found innocent or have the charges dismissed.
This response does not create an attorney client relationship nor should the advice be relied upon because it is not specific to your legal situation. Before you depend on legal advice, you should retain competent counsel.
Mr. Wiltshire is right about drug testing. As for alcohol testing, as it only stays in your system for a day or less, it is unlikely the Judge would test for alcohol unless he or she suspected you were intoxicated when you were in Court. I have seen this happen one time and it was not pretty, so don't make that mistake.
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