"I don't think the Leuchter results have any meaning. There's nothing in any of our data that says those surfaces were exposed or not. Even after I got off the stand, I didn't know where the samples came from. I didn't know which samples were which. And it was only at lunch that I found out, really, what the case involved. Hindsight being 20/20, the test was not the correct one to have been used for the analysis. He presented us with rock samples anywhere from the size of your thumb up to half the size of your fist. We broke them up with a hammer so that we could get a sub-sample; we placed it in a flask, add concentrated sulfuric acid. It undergoes a reaction that produces a red-colored solution. It is the intensity of this red color that we can relate with cyanide concentration. You have to look at what happens to cyanide when it reacts with a wall. Where does it go? How far does it go? Cyanide is a surface reaction. It's probably not going to penetrate more than 10 microns. Human hair is 100 microns in diameter. Crush this sample up, I have just diluted that sample 10,000; 100,000 times. If you're going to go look for it, you're going to look on the surface only. There's no reason to go deep, because it's not going to be there. Which was the exposed surface? I didn't even have any idea. That's like analyzing paint on a wall by analyzing the timber that's behind it."