>I heard about the dna process before but this is the first special I've seen where they used it in conjunction with history, documentation, a family tree to trace back to before slavery in Africa. The dna bank (to my knowledge) is only filled with volunteers in Africa though in order to allow African Americans to trace their ancestry back to a specific tribe or area.

Not first. I've read a few years ago that they found a few tribes deep in central-to-south Africa who had Jewish genes. Which confirmed some stories which couldn't be proven before, that a group of families did migrate south in distant past.