Hi, @churchboy. This was a very interesting read. I never really gave much thought to how a transfusion would affect the DNA, so this was absolutely interesting to learn more about. But it makes a lot of sense that a bone marrow transplant could lead to some genetic issues.

If the recipient commits a crime, DNA identification would lead to the arrest of the donor while the recipient walks unless there are extenuating circumstances.

Luckily DNA resulsts are not really allowed to be used as a primary evidence in most countries in the world, at least here in Europe. So the police would in most countries need another type of evidence, and then use the DNA to strengthen the credibility of their theory.