This depends on many factors, including what you are charged with and the facts involved, whether you have previous drug/ alcohol criminal history, what procedures the particular court you are in follows, and whether treatment is required/ recommended with the particular crime you have been charged with.
It depends. I would need to know more information about why you are doing a UA and who ordered it.
Aaron M. Lukoff
Attorney at Law
Criminal & Civil Traffic Defense
Law Offices of Aaron M. Lukoff & Associates, PLLC
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From the information provided, I can't begin to say what the courts or the supervising authority (probation, pretrial supervision, etc.) might do, but play it safe. They likely CAN test at any time. An evening of fun with your friends could result in harsh consequences. Just leave it alone while you are being supervised.