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Was "mixed blood" found at the crime scene?


blood in drain
This bloodstain revealed the mixed DNA of Meredith and Amanda. Meredith's genetic markers were much stronger than Amanda's, suggesting that the sample was composed of Meredith's blood mixed with residual DNA from Amanda.
No. What forensic investigators found was the mixed DNA of Meredith and Amanda in a total of six samples among dozens that were taken. Three of these samples were from the bathroom shared by the two women (the other housemates shared a different bathroom).

All of the mixed DNA samples from the bathroom were visible bloodstains. Most likely they were composed of Meredith's blood mixed with an organic residue containing Amanda's DNA. No test was performed to determine if any of these samples contained the blood of both Meredith and Amanda, and there is no evidence that any of them did.

The other three mixed DNA samples were taken from latent stains revealed with luminol. No test was performed to confirm the presence of blood in any of these samples.

Click here to read more about the luminol results.

The prosecutor has tried to insinuate that these findings are incriminating, but, as with other aspects of his case, the insinuations do not lead to a specific theory. The most plausible explanation is that the mixed DNA is simply a result of cohabitation. As an example for the sake of comparison, investigators used luminol in Raffaele's apartment and found a latent stain with the mixed DNA of him and Amanda. All it means is that two people have been sharing the same space.