I watched the "Good Eats" episode where AB made his beef jerky. He did actually use a home made dehydrator and did not air dry the beef. I don't recall offhand, but he did indicate the beef had to reach a certain temp to dehydrate properly. I don't believe he was using unsafe procedures. In fact, I have made his jerky recipe for the last couple years in my Excalibur dehydrator and it comes out perfectly, just like my own recipes. Just my 2.6 cents......