Kaosium
Philosopher
- Joined
- Oct 12, 2010
- Messages
- 6,695
From my favorite website, murder of Meredith kercher.com:
A popular defence against the claim that the footprints were made in blood is that Luminol also fluoresces with sprayed on some substances other than blood. The reason the Luminol is useful to crime scene reconstruction rests on the fact that the substances that cause false positives are typically not found at crime scenes and in the cases of substances such as some brands of enamel paint the false positive is easy to detect because the reaction is not limited to a blood deposit pattern but covers the entire affected surface. In our case the Luminol reaction were in the shape of feet with three of the traces having succinct details to identify them as footprints compatible with Amanda Knox and Raffaele Sollecito. The footprints were also limited to the part of the corridor between Meredith and Amanda's room and were not found anywhere else in the cottage. This would allow us to eliminate reactions to paint or to terracotta or ceramic elements in the tile
Tesla, TMB doesn't give false negatives, not really, it's a natural chemical reaction that occurs, if it didn't happen every time it would be worthless as a detector of blood. What the prosecution claimed after being caught lying was that it was diluted to the extreme that TMB couldn't detect it, but that's why it showed up with luminol. However at this point you have to realize they are not contending blood they're claiming that something (probably water--can't think of anything else) got a few drops of blood in it and it was spread around the house. That could have happened at any time before or after the murder and there's utterly no reason to think they all happened at the same time, or that they were all the same substance. One thing however is clear: the absolute most it could be is water (or whatever) that had a few drops of blood in it.
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