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I wonder if RA did not SA them because he was aware of semen being identified as his, but overlooked the less conspicuous ways he could have left DNA on them or at the crime scene.ETA I am curious, are you implying that if RA's DNA is not at the crime scene it means LE can't believe RA killed Abby and Libby? Because that doesn't make a lot of sense to me. Crime scenes are left without DNA from killers all the time and yet convictions can and do still happen. JMO
And, I suppose, unfortunately gratified some sexual compulsion by forcing them into various states of undress.
Just my speculation.