[lousyd]

Who could possibly not be a vested interest? It's hard to think of more than a few cases where I've personally wanted to learn about something and didn't, at some level, hope for one answer or outcome over another. "Ban vested interests" is an impractical policy. stevenhuang's suggestion to be aware of them is much more practical and has the benefit that "vested interests" who truly do wish to fund an objective study aren't stopped from doing so.