Where can i report underage drinking? have pictures and proof?

Someone I know has been illegally drinking. he was ilelgally drinking in the state and he is underage. He posted pictures on facebook of him and his friends doing this. He is also a very mean and bad person and I would love to turn him in. But my question is, where do I go report this, do I take the pictures... show more Someone I know has been illegally drinking. he was ilelgally drinking in the state and he is underage. He posted pictures on facebook of him and his friends doing this. He is also a very mean and bad person and I would love to turn him in. But my question is, where do I go report this, do I take the pictures somewhere? he lives in a different state but the drinking age is still 21 in that state.
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