Quote:
Originally Posted by Boris
http://viewfromwilmington.blogspot.c...-of-blood.html
This is a great blog post that discusses luminol testing and testing for the presence of DNA. It casts serious doubt on the prosecution's forensic methods. Basically, the alleged bloody footprints were probably not bloody. Also, the presence of DNA does not mean that blood was the source of the DNA. So the alleged mixing of Amanda and Meredith's DNA in the bathroom does mean that Amanda and Meredith's blood was mixed together in the bathroom.
Don't know about disregarding the bloody footprints (there were some "negative" impressions in puddles of blood, and other "positive" impressions of-- presumably-- blood. While it's possible that the positive impressions weren't blood, before the idea is totally rejected another, a better explanation must take its place. As I said, the defence offered fruit juice as an explanation, which reacts to Luminol (but not as strongly), but then you have to get into on what occasion was all this juice being tossed around and then try to verify it.
(But then you don't necessarily want to pursue the fruit juice hypothesis too enthusiastically, because in so doing you are implicitly or explicitly accepting that the footprints belong to the people accused.)
Instead there was plenty of blood to be tracked around, and absent a compelling alternative they sanely concluded that bloody footprints in the same house as a recent murder is pretty much the only place they're ever seen. Honestly it's a bit daft to debate what else those footprints could possibly be under these circumstances.
To the other point, Massei considered that the mixed DNA wasn't a blood/blood mix. Any bodily source will do it, so skin from vigorous scrubbing seems possible. That the samples were mixed (landed together and dribbled down the sink together) was accepted since two samples landing in the same place at different times would have registered distinct origins even if the end point was intermingled.