[the OlLine Rebel]

Since when does blood not yield DNA?

[imardmd1]

I'm not an expert in this, but I learned that red blood cells do not have nuclei, hence mitochondria, so other ways to get DNA is better. Actually, my statement was not quite right. I was thinking of dried blood in the Turin shroud. Here is a little more on the DNA aspect:

Source: Where do DNA samples come from?

Excerpt:

"Red blood cells do not have any DNA, as they lose their nuclei (the compartment in a cell that contains the DNA) as they mature. So the DNA in your blood is in your white blood cells. To get at it, scientists first spin a small sample of your blood at high speed, to separate the cells from the blood fluid. Next, they release the DNA from the cells using a detergent and a special enzyme. Finally, they add alcohol, which makes your DNA appear as sticky blob in the mixture."

I do not know that the stains on the shroud would have DNA, but dried skin cells ought to. Just thinking from a layman's viewpoint.