The only evidence that would conclusively authenticate the Shroud against naysayers and claims of forgery is Jesus DNA. It would be matched against the blood — type AB — found on the Shroud and considered rare.

What is the blood type on the shroud?

As it turns out, not only was the image on the Shroud of Turin made with human blood, but it was of the same blood type – AB – as the blood on the Sudarium of Oviedo. AB blood is the rarest type in the world, so the fact that it is found in both shrouds is not likely to be a coincidence.