The book web page has draft chapters.
Daniel Carpenter Expert Blindness
From Tyler Cowen's interview with Daniel Carpenter:
COWEN: Which are the most and least captured federal agencies in the technical use of that term?
CARPENTER: Oh, good question. Hmmm. I don’t have a rank ordering for you, from which I can draw the top and the bottom. Knowing some people who’ve been involved in the space, and seeing also what’s gone on worldwide, I would say one agency that has been captured or plausibly captured would be the Nuclear Regulatory Commission.