Right, but planting evidence would have required an explicit conspiracy, which could have been exposed by even one honest policeman, and I suspect that the majority (even the vast majority) of Perugia policemen are honest. However, fallacious logic does not require a conspiracy. The prosecutor can order the police to keep testing and testing and testing until something is found. This is not obviously dishonest, and no honest policeman would object. And yet it is dishonest because the probability of finding a false sample positive is greater than zero, and true sample negatives are ignored.
I believe if they hadn't found RS's DNA on the bra clasp hook, they would have kept going back until they found it on something else.[/w witnesses ]
ETA below is my effort, did something wrong with sunmaster14's sorry.
Planting remains a viable theory, just Mignini and Steffanoni required. All the evidence is essentially manufactured.
The staging, the witnesses Nara, Toto, Quintavalle. The time of death. The confession. The alibi breaking in the Sollecito Knox sequence pre arrest. The multiple perpetrators. The knife (use of LCN dna).
In my understanding of the case all this is manufactured by one means or another.
I well remember Arthur Allan Thomas
quote
A Royal Commission of Inquiry was established, headed by retired New South Wales Justice Robert Taylor. This declared Thomas to have been wrongfully charged and convicted, and found that among other improprieties, police had planted a .22 rifle cartridge case in the garden of the house where the murders were committed. The case was found four months and ten days after the area had already been subjected to one of the most intensive police searches ever undertaken. The cartridge case was said to have come from a rifle belonging to Thomas. However, the police tested only 64 rifles in an area where this weapon was common and found that two – including the one belonging to Thomas – could have fired the cartridge case found in the garden. This was the link to the deaths of the Crewes although it was later admitted that the case was "clean" and uncorroded when found. As such, the condition of the case was inconsistent with having lain in the garden, exposed to weather and dirt for more than four months.