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When someone gets a blood transfusion, does the blood donators DNA mix with the reciever's DNA?

for example, if the donor commited a crime, and blood was found and used to determine DNA, could the reciever have matching DNA in their blodd? or vice versa?

Red Blood Cells don't actually have any DNA in them. The DNA that comes from blood comes from the white blood cells, which are part of the immune system. Usually after somebody donates blood the white blood cells are removed from the blood. If this is not done the donor's white blood cells can start attacking the recepient's body causing serious damage or death.

Blood will have a lot of things in it, various proteins, red and white blood cells. There would be some DNA, and that would be in the white blood cells. Red blood cells are basically just bags of hemoglobin without nuclear material.

As for DNA evidence, well if blood was used to generate the DNA evidence, there might be a fraction, a very small fraction from the donated blood. But I think a mixed result would look like a small amount of contamination. I don't know what the fraction from a typical donation is. But I think a cheek swab is the more likely way a DNA sample is taken, so nothing there.

No. Nor in a receiver.

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