You have not set forth enough facts. This is posted under DUI. Were you charged with DUI? Disorderly conduct? Public drunkeness?
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It is unlawful to obey a reasonable request from a law enforcement officer. In a bar, the officer is well within his rights to ask for ID to establish your legal presence in the premises. If you were indeed driving the same answer applies.
Every legal matter is fact specific, and there are often nuances in every case. This is intended for comment only, and does not create an attorney client relationship.
The answer is no based on the facts you gave. The officer will fabricate those facts later to justify the arrest and charges.
It is unlikely you will win in court. There would seem to be a readily apparent reason why an officer would ask you for an ID in a bar.
Probably not, if you were in an establishment that has a minimum age, law enforcement can ask for identification to prove your that you were lawfully present.
Without knowing all the facts of the case it is impossible for anyone to say whether or not you will win the case.
I believe that you were likely asked for ID to verify your age at a bar. I'm just unsure what the charge would be in your case. Minor attempting to posses alcohol? Anyway, not enough facts here to intelligently answer the question. Although I do believe the cop can ask for you for ID to verify age. Good Luck!
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