https://phys.org/news/2018-07-shroud-turin-fake-retracted.html

One of the experiments involved applying blood to the body of a live volunteer (who was lying in a pose reminiscent of the person seen on the shroud) and then wrapping him in linen to see what sorts of stains it would leave. They also noted that the Bible reported that Jesus had been stabbed in the side with a spear—to mimic such a wound, the researchers attached a sponge to a wooden stake, soaked it with blood and then used it as a spear to impale a mannequin.

The researchers report that the bloodstains on the shroud are inconsistent—blood flowing in rivulets would not have formed stains in the ways observed on the shroud. As one example, they point out that blood flowing from a wound to the hand could only have made the stains seen on the shroud if the person were standing upright—the Bible reports that the body of Christ was put in the shroud after death. They conclude by claiming that it would have been impossible for the blood stains on the shroud to have originated in the way the Bible describes; therefore, they say the shroud is a forgery.