The fingerprint I'm interested in is the one from the side of the patio door marked up "unidentified". This was farmed out to various countries across the world for Interpol to check databases. No matches found but Weinbaden (you can't beat German attn to detail!) commented that the fingerprint could have originated from a woman or youth but not a child. I assume from this a man was ruled out based on size (size does matter!). Then we have GA who attributed the fingerprint to a male officer!?
A well known phenomenon exists whereby a police officer(s) arrive at a theory/suspect(s) and then dismiss anything that points away from the theory/suspect. Worse still 'noble cause corruption' comes into play where evidence that points away from the theory/suspect(s) is deliberately withheld or even fabricated. I'm not suggesting this has happened here as I don't have all the detail but at first glance it looks a bit dodgy!?
Well Amaral wasn't making anything up according to the files, he was just acting on information received from the technicians;
Date: 2007/05/18
Service Information
To: The Coordinator of the Investigation, G. Amaral
From: Assistant Specialist Irene Trovao
Subject: Identification of finger print
I inform you that according to report nº 140/07 there is a single finger print with sufficient value for identification.
It was revealed with Dragon Blood and gathered from the side of the living room window/door of Ocean Club apartment 5 A on 4th May 2007 after the disappearance of the child.
This morning Officer Silva delivered various fingerprints belonging to his officers who were on duty at the apartment on the night of 3 – 4 May 2007.
These were compared to the finger print which was identified as being that of Nelson Filipe Pacheco da Costa of the Lagos GNR.
https://www.mccannpjfiles.co.uk/PJ/FINGERPRINTS.htm