Researchers of the Hebrew University of Jerusalem reported the presence of pollen grains in the cloth samples, showing species appropriate to the spring in Israel. However, these researchers, Avinoam Danin and Uri Baruch, were working with samples provided by Max Frei, a Swiss police criminologist who had previously been censured for faking evidence. Independent review of the strands showed that one strand out of the 26 provided contained significantly more pollen than the others, perhaps pointing to deliberate contamination
Another item of note is that the olive trees surrounding Jerusalem would have been in full bloom at the time, meaning that there should have been a significant amount of olive tree pollen on the Shroud. However, there does not seem to be any at all
In the winter of 2002, the Shroud was subjected to an aggressive restoration which shocked the worldwide community of Shroud researchers and was condemned by most. Authorized by the Archbishop of Turin as a beneficial conservation measure, this operation was based on the claim that the charred material around the burn holes was causing continuing oxidation which would eventually threaten the image. It has been labeled unnecessary surgery that destroyed scientific data, removed the repairs done in 1534 that were part of the Shroud’s heritage, and squandered opportunities for sophisticated research.
all from wikipedia. At the very least, the issue remains in dispute.