On 4th May 2007 at 3:30pm, a forensics team from the Police Science Laboratory, experts João Paulo Cardoso and Fernando Viegas, investigated the apartment in greater detail. Both Gonçalo Amaral in “A Verdade Da Mentira” and Kate McCann in “Madeleine” make this the Lisbon team. Both make the mistake of putting Irene Trovão in this, when she been at the apartment on the morning of 4th May.
The report of the third forensic investigation is at http://www.mccannpjfiles.co.uk/PJ/5A_FORENSIC_4_5_7.htm and it is excellent reading.
In the map of the locality and the identification of the McCann apartment 5A, north is at the bottom and south is at the top. This seems to be a convention.
Next, the diagram of the apartment layout is much better, though some errors remain.
Check the photos and you see the twin’s cots are 90° out. It is clear that they are offset to make space for the wicker chair, while the right hand side of the window rests against a wall, where the wicker chair had once been. This is as per the crime scene #2 photos.
What did Cardoso and Viegas find?.
Footprints. The scene had been trampled to the extent that retrieving footprints was not feasible. There were also dog paw-prints.
Contamination. The apartment was contaminated with dog hairs and with fingerprint dust, making it hard to retrieve trace evidence. The children’s bedroom and the area inside the living room patio doors were worst affected.
Hairs. The search for these was restricted to the entrance hall from the front door, the route from the living room patio doors to the door of the children’s bedroom, and the entirety of the children’s bedroom. 6 samples were found (not 6 hairs, but 6 samples covering 6 areas). The remainder of the apartment was not searched for hairs.
Fibres. There is no mention of a specific check for fibres. Whether this is covered by a check for hairs is something I don’t know.
Semen. A variable-wave light source was used to look for semen traces. A number of potential areas showed up and these were tested chemically. Only one returned a positive test. That was on the bedspread of the bed by the window in the children’s bedroom.
Sedation chemicals. The area around the pillow on Madeleine’s bed was checked for the smell of substances like chloroform and ether. Nothing was detected. I do not know how long this smell lingers, and the third search started 15½ hours after Kate raised the alarm.
Blood. Two sweeps of the entire apartment were made for blood traces. The first used a variable-wave light source and turned up some potential locations, but none of these passed a chemical test. The second was a visual check, with a number of potential areas being found, but again, none passed a chemical test. There is no mention as to whether areas behind furniture was checked or not.
Forced entry. The doors and windows of 5A were inspected for this, and no sign of forced entry was found.
Exterior. The exterior of 5A was examined and nothing of forensic value was found – no footprints, no cigarette stubs.
The evidence recovered was passed to the INML (National Institute of Legal Medicine) in Lisbon.
The cleaner for apartment 5A, Maria da Silva, stated she cleaned the flat on Saturday 28th April, before the McCanns arrived in Luz. She says she last cleaned 5A on Wednesday 2nd May, the day before Madeleine disappeared. In her book, Kate confirms the Wednesday clean, and adds that the apartment was also cleaned on Monday 30th April.