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"Who is preventing you or prohibiting anyone else from testing the Intelligent Design hypothesis?"

Many academic institutions have shut down any such research and it is virtually impossible to get any grant money to explore the subject. Ben Stein covered the subject extensively in the movie "Expelled."

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Many academic institutions have shut down any such research and it is virtually impossible to get any grant money to explore the subject.

So it's not that anyone is preventing you from testing the hypothesis, it's that nobody is willing to fund your work. Maybe that alone says something?