Fibers don't seem like the "exact" science they claimed it to be yesterday. Oh, it's made of nylon? Well, that's a similar fiber; can't say it's a match, but it's similar. Cotton, nylon, wool, acrylic -- they're all pretty common.
Blood, can be explained, although no one has tried to explain it. Hair, everyone's hair is everywhere!
I don't understand this comment. It is not anything like the testimony the fiber witnesses gave.