I was researching the arsenic rules, last summer because our local paper was making a big deal of the Democrat claim that Bush was trying to poison the children by not lowering the arsenic percentage. I found this great website with all these studies that showed that arsenic and selenium were related, in that one cancelled out the other (it's more complicated than that). But when Bush passed the Clinton standard in October, I went back to the website and the finished report had deleted all the studies which showed that arsenic was not really poisonous as long as selenium was also present (it usually is because they are both found in areas of former volcanic activity). And to make matters worse, the author of the bogus study was put in charge of inacting the arsenic rules.
A tip for everyone - If you see material on the web that you think you might want to use again, bookmark it AND save it to your hard drive. Disk space is really cheap.