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But Sollecito told police he could not remember if Knox was with him that evening or not.
Even assuming his memory was hazy because of the drugs, it seemed odd that a young man who had just embarked on a new relationship could not recall whether he had spent the night with his girlfriend or not. Sollecito claimed he used his computer to download and watch cartoons and Amelie.
Putting these two facts together, the defence pointed out that Sollecito’s DNA on the bra clasp could have been a consequence of a careless police technician stepping on Sollecito’s DNA elsewhere in the flat and then entering the room and stepping on the bra clasp, even though no DNA of Sollecito was found anywhere else in the house except on a single cigarette butt in the ashtray. Although not visible to the naked eye, the chemical Luminol which flashes blue on contact with blood revealed a spot in the room of the flatmate whose window had been smashed and room rifled.
But knowing that the sample was small, Stefanoni feared that cutting it in two would yield no result at all, and chose to amplify the entire sample in one unrepeatable test.
Under cross-examination, Stefanoni explained that quantification had given a result of “too low” as the machine she used that day was not the most sensitive one in the lab.
Knowing that samples undetectable by the machine can still be sufficient to yield positive results, she chose to continue with testing.
One spot in particular attracted her attention: a visible scratch on the flat of the blade.
The swab taken from this scratch yielded a positive ID for Meredith Kercher.