Several years ago, some Texas researchers did a DNA study of supposed Shroud bloodstains, but the provenance of the samples they used was questionable and their results have not been officially recognized. Nonetheless, their findings concluded that the blood on the Shroud is from a male human. They also stated that the blood is so old and degraded that very few DNA segments were found, eliminating any possibility of "cloning" anything from the blood found on the cloth. Other DNA experts argue however, that so much contamination exists on the Shroud that no DNA test, no matter how carefully done, could ever be considered definitive. During the 1978 exhibition and scientific examination, the cloth was handled by many people, including most members of STURP, the Church authorities who prepared it for display, the Poor Clare nuns who unstitched portions of it, visiting dignitaries (including the Archbishop of Turin and the emissary of King Umberto) and countless others. During the five days and nights of the 1978 examination, the Shroud was continuously exposed to contamination as it lay unprotected on the support table. Every member of our research team, including myself, left DNA on the cloth. And remember, the cloth has been displayed and handled thousands of times throughout its history. Once again, the Shroud presents us with an enigma that even DNA evidence may not definitively unravel.
from here..
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