The poster is talking about Grime's dogs alerting in apartment 5A and the car rented by the McCanns 3 weeks after Madeleine's disappearance.I thought the same thing, however, I started thinking about the DNA and those places the dogs hit on did turn up DNA, just inconclusive results.
From Looking for Madeleine by Anthony Summers:
"Of dozens of other samples recovered from Apartment 5A and sent to the UK for analysis, Sample 3A was the only one found to be – possibly – from a member of the McCann family. All the rest were either ‘too complex for a meaningful interpretation’, ‘too meagre’, ‘incomplete’, or (in one case) identifiable with the detective who lifted the sample. In the few instances where [John] Lowe noted a ‘mixed’ or ‘low-level’ DNA result, the scientist’s view was that there were ‘no conclusive indications that justify the theory that any member of the McCann family had contributed DNA to [the] result'.
....Then there was the Renault car the McCanns had hired three weeks after their daughter’s disappearance and the sample – numbered 10(2) by the lab – that had been recovered from its boot....In his final report, which again addressed Sample 10(2), Lowe found that the sample ‘appeared to be from at least three persons....'In my opinion, that result is too complex for a meaningful interpretation.’ The laboratory findings did not reflect any fluid identifiable as blood having been recovered from the car. As to hair retrieved from the Renault – and compared to hairs removed from Madeleine’s hairbrush – Lowe’s colleague Andrew Palmer reported that it ‘was not possible for me to determine if, or if not, these could have been from Madeleine McCann’. Of the nail fragments found in the car, one turned out to have been Gerry’s and another Kate’s. Finally, there was the Budget electronic ignition key and key ring removed from the map pocket on the inside of the driver’s door of the rental car. Using the Low Copy Number test, Lowe noted it as having ‘an incomplete low-level DNA profile that matched corresponding components in the profile of Gerald McCann’. Not a revelation – since Madeleine’s father had driven the car for many weeks."
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