Er, if you're the one claiming there's a treaty, it's your job to prove to demidog that there is one, not his job to prove to you that there isn't.
It's possible, and maybe even probable (thanks to Lincoln Lover's post) that it never reached Treaty status and was voted on by the Senate. I simply can't find a lot of evidence on that. Nor can I find much evidence about the signing particulars of the Geneva Convention, which we seem to hold dear.
I think I've shifted the burden through what I've posted. Some here, possibly including you, apparently disagree.