MistyWaters
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That sounds like there are samples that are mixed together. Like blood smears that came from more than one person (victim and killer) or something along those lines.
There would also probably be DNA that could legitimately be there from other sources. For instance the grandmother's DNA might be on Libby's jacket if she hung it up for her, or unknown DNA on an object near the scene that might or might not be connected to the crime.
I am also wondering if one of the issues is that somebody touched the bodies during recovery. That could have contaminated the scene pretty thoroughly.
eta: changed wording so it didn't sound like a rumor.
If the best they have is touch DNA that’s mixed....I sure hope not, that’s very weak evidence.