[azeotropic]

shrug I don't recall seeing it in print anywhere. I've mentioned it to colleagues who study prions, and they're grossed out by the idea, but didn't think it was impossible.

I suppose you could try testing samples of hamburger for human DNA, but it would be hard to rule out innocent low levels of contamination from household dust (mostly human skin cells). Considering prions are infectious at such very low concentrations I'm not sure if any assay could rule it out.