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Well to play devil's advocate if the funding is 70%, and the standard curriculum is required to be taught (i.e. they can't "replace" evolution), you could say that the flaky stuff is being taught with the 30% remaining funding the school would raise itself (presumably from religious sources if the school is a religious school).

I guess I'm torn, in theory I'm not against private schools and if a group of people want to get together and fill their kids' minds with misinformation then, hey it's a free country.

In practice, I highly doubt the evolution portion of the curriculum would be given the proper presentation.

But if the students pass standardized testing, what else can you do? Have secret students that sit in class and rat out teachers who give a slant to the curriculum?

If you are going to have private schools, this is part of the consequences. Unless you had a standard curriculum that couldn't be added to, but that defeats the whole point of a private school.