Vixen
Penultimate Amazing
Vixen,
There was a spot of blood on the faucet, and Amanda's DNA alone showed up (meaning not mixed with anyone else's). it is a reasonable inference that Amanda's ear was the source. IIRC I saw a pillowcase of hers with a blood spot, which is consistent with her having an infected ear.
With respect to Rudi's DNA, let's recap our arguments, given many times previously (even within the last three weeks and for your benefit). One, you could toss all of Rudi's DNA and still convict him at least twice over, maybe three times. Two (apart from any other consideration), Rudi's DNA is slightly more incriminating than Raffaele's and way more incriminating than Amanda's, because she lived there and Raf visited there. Three, if Rudi's DNA were in the low template range and collected/processed exactly as the knife profile, I would toss it in a New York minute. Four, if Rudi's DNA were mixed with other men's the way the bra clasp sample was mixed, I would say it doesn't have much value. Five, if all of the evidence were collected as late and as badly as the bra clasp, then it would not have much, if any, value.
Yes, science should be objective. When Brad Bannon was preparing to defend David Evans (one of the Duke lacrosse three), he read John Butler's textbook on DNA profiling. His cross examination of Dr. Brian Meehan was one of the pivotal moments of the case. For the newest edition of his textbook Dr. Butler asked Mr. Bannon some questions, including his common tactics in challenging DNA evidence. Mr. Bannon replied in part, "Did the lab follow acceptable standards of DNA analysis? Did it follow its own protocols? Is the lab applying those standards and protocols consistently or selectively? For example, why do you call a peak below 150 RFU as a true allele for one purpose, or in one case, but not for another? If there are such internal inconsistencies, do they usually inure to the benefit of one side's theory of the case? If so, is that evidence of bias?"
Mr. Bannon's ideas on threshold are consistent with what Rudin and Inman said. The textbook An Introduction to Forensic DNA analysis, 2nd ed. (Rudin, N. and Inman, K., CRC Press 2002, p. 121) states, “It is important to have some predetermined limit to distinguish what is signal and what is noise.”
I hear what you are saying. However, in a crime scenario, perps will wear gloves and will try to avoid leaving any trace. It is unfair criticism to knock a forensic doctor who does find a trace, inadvertently left behind on the grounds there are not bucketloads of it. Forensic means minute, after all. In fact, Raf's DNA was not Low Copy Number. It was hidden under the body well-protected. It is specious for the defense to claim it came off a rubber glove.
