MagisterCultuum
Great Sage
I can still see no reason to doubt the accuracy of the Turin Shroud dating.
The dating may be relatively accurate for the sample tested, but that does not mean much for the shroud as a whole. The shroud was repaired at least once during the middle ages, after it was damaged in a fire. To avoid damaging the image itself, the test sample was taken from a portion of the cloth that many believe was actually a later repair.
Particulate evidence seems to point to an origin in ancient Judea rather than medieval Europe. Dirt particles were a match for the limestone of the tombs of ancient Jerusalem. Most of the pollen is from the Jerusalem area and much of it is exclusive to the middle east rather than Europe. I can't seem to find confirmation right now, but I recall hearing somewhere that at least one type of pollen is from a plant that is believed to have gone extinct around the time of the fall of the Western Roman Empire.
There were bacteria living on the cloth, whose respiration could have added fresh Carbon 14 to the cloth and made it appear younger.