I'm of the believer pee is pee. From the studies I've read and my personal experiences I don't see where it makes a difference. Some will argue if it's not known then why take the chance to introduce something foreign. Well that's a good point I guess lol. I've killed several mature bucks and have whizzed several times from my stand. I do however try to take precautions about doing it. I try to go before, hold it till after, or go away from my stand etc... but if it comes right down to it......... I let it fly. I've actually urinated in scrapes before and saw bucks working them the day after.