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If I recall correctly, the bottle was empty and it belonged to your roommate? You can mention this very briefly--just put "empty" in front of "alcohol bottle." This also makes it more clear why you didn't think it was a violation, because if it was a full bottle and you were underage you would have realized it was a violation.

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The sentence "I did legitimately violate school policy" is a little awkward. You might want to rephrase or delete that sentence. Otherwise, this looks fine.