I know in Louisiana, the minimum age to get into a bar is 18. Some have higher ages, but most of them let you in at 18. They put a big X on your hand if you're under 21, and you get a bracelet if you're 21+. Either way, its a really simple system to circumvent. And that's just in Baton Rouge.
I've been to bars in Uptown (New Orleans) that just check to see if you're 18 and that's it. No one really cares past that point once you're inside. Most of the ones there didn't even have a cover charge.
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