Especially since it would be trivial to simply put him in front of a plain white backdrop.
Mistah Osama, he daid.
Come on. On CSI, Grissom could put one of those photo-enhancing tools onto the video of the white sheet in the background and see the thread count of the cotton. By the weave, he could tell in which country it was grown. They insert that info into a super computer and out would spit the name and hut of the textile vendor in northern Pakistan who sold it to Binnie's guys. It's easy. I've seen it on TV.