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(b) Any person under the age of 21 years who purchases anyalcoholic beverage, or any person under the age of 21 years whoconsumes any alcoholic beverage in any on-sale premises, is guilty ofa misdemeanor.
You can challenge what was in the cup you were consuming. The officer does not need to see you purchase anything. Consumption is enough. You can argue there was only soda, water or juice in the cup. You can also ask if the court offers a diversion program for first time offenders, so you can get the case dismissed.