You already have to show ID to see rated-R movies in the US. I don't see how this is any different.
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If an individual theater wants to do it, sure, but I don't agree with the state requiring it.
There's something sort of hypocritical about wanting to give parents more control over decisions about their children while simultaneously taking it away.
If I have a mature child who wants to see an acclaimed art film that is R rated for whatever reason, why shouldn't I be able to make that decision? What's the next step? Verification on blu-ray players?