While looking up the "documentary" quotes, I came across this. It's Amarals proof as to why the front door could not have been used. The bits that particularly struck me I have put in bold.
43.25 - Final Evidence
43.28 – With the help from one of the major experts from the Scientific Police, who worked for the Polícia Judiciária, Alexandre Simas, Gonçalo Amaral intends to prove, first, that it was impossible for the child to be abducted, starting by demonstrating that the indications prove that the apartment's window and door were not forced.
43.47 -
How does one open a door like this, without the key? 43.51 – Alexandre Simas, Expert (Former Polícia Judiciária): "This type of apartment door, normally there are only three possibilities: to extract the lock's cannon, which didn't happen, or it would have been reported; a false key, a copy or
one that was used without permission; or using a malleable material, as long as it's not locked, it's introduced, and it makes the lock go back inside. But when it goes in, even if it did, it would hit this screw. If it hits the screw, no matter how much I force it, it doesn't jump to open the lock for me.
44.33 – "If the door wasn't opened without a key, the window doesn't bear any traces of having been forced, either.
44.40 – "These windows have a very good characteristic to check if they were forced or not. Being made of lacquered aluminium, any screwdriver, any instrument that is used to make the lock jump, immediately leaves a mark. What we can see here, there is no break-in, the mark that is there belongs to the lock itself as it rotates, sometimes one does this with the lock in place, and it hits there. So, to open this window, all we have to do is this. To close it, it's impossible, because either one has a magnet on his fingers to pull the window…"
45.18 – Another important fact is revealed by the fingerprints that are left on the bedroom window, which the McCanns insist they left closed, and is supposedly found open when the mother notices her daughter is missing. The only fingerprints that are found belong to Kate McCann, and reveal that they were made by opening the window.
45.42 – These three indications mean that there was no abduction, and that is proved. No abductor entered apartment 5A, through the door or through the window.
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If this is the true standard of policing in Portugal, I feel a life of crime in the sun beckoning.......