There's an even more important reason to study the sudarium. for him, the stains on the cloth are like a fingerprint, unique to one person. >> if this cloth was wrapped around the head of another person who had maybe even suffered the same kind of torture and wounds, then the stains would have a different shape and a different format. >> for guscin, this was to prove critical because when the team compared these bloodstains on the sudarium with those on the shroud, they made an extraordinary discovery. the bloodstains appeared to match. >> so we can conclude the two cloths were used at the sam...