Luminol (3-aminophthalic hydrazide) is a chemical that reacts with the microscopic particles of iron found in hemoglobin, causing an organic peroxide reaction. If blood is present, its oxidized state is expressed by a chemoluminescent burst, i.e. the sample glows with a bluish color in the dark. This chemical was used in this case to enhance several footprints found at the crime scene to have been cleaned, most likely by the perpetrators.
Meredith Kercher – 8W (US)
FP4 – The notorious bloody barefoot print found on the bathmat that was normally located in the bathroom shared by Knox and Kercher, but which was found in Amanda Knox’s room. This print was compatible with the right foot of Raffaele Sollecito.
FP6 – “Following the procedure of luminol enhancement, it was shown that Knox, her feet stained with the victim’s blood, went into Romanelli’s room… leaving footprints revealed by luminol, some of which were mixed, i.e., constituted from biological traces of both Knox and Kercher” (pg. 11, SC Ruling). This, along with a multitude of other factors, lends itself to the theory that Knox was a major part of the staged break-in in Filomena Romanelli’s room.
The Italian Supreme Court of Cassation (SC) reasoned that Rudy Guede could not have killed Meredith Kercher by himself, based on the evidence; they outright reject the “lone wolf” theory. The SC specifically directs the appeals court to consider prior (and now definitive) findings in the Rudy Guede decision that there were multiple attackers and that the break-in was staged. This ruling stacks the deck against Knox and Sollecito in a big way! The SC also makes clear its belief that the footprints attributed to Knox, which contained both Knox and Kercher’s DNA, were made in blood. They also affirm that they found there was no evidence that contamination occurred.