On a serious note (as serious as this topic can get) I was at a hunting seminar one weekend and this topic came up with the presenter. He stated that it is not that big of a deal as far as the hunting goes. He said that deer can obviously smell crap and urine but they dont' smell enough to tell that it is human and not some animal in the woods. The moral of the story was that pissing or crapping by you blind will not hurt your chances. Deer smell this stuff all of the time. This guy said that is why he never bought cover scents, if he needed it he could piss on his own boots instead of putting fox piss on his boots. The deer won't know the difference.