In Portuguese criminal libel cases defamation has to be proven beyond a reasonable doubt but in civil libel cases a defence of within the bounds of probability will prevail.
Central to the present libel action is the book 'The Truth of the Lie in which Amaral sets out his considered conclusions. The McCann's argue that not only does the book defame them personally, but by influencing public opinion it has also hindered efforts to find Madeleine.
What is being contested is not only Amaral’s opinions, but his right to express them publicly, it is consequently a freedom of expression issue in Portugal.
Amaral is no fool, he knows that his thesis was based on official police files which are in the public domain. He need only repeat his claim that on the balance of probabilities that Madeleine died in Praia da Luz in order to repel the allegation of defamation. To counter this the plaintiff has to provide proof that this claim is untrue, something which their lawyer has summarily failed to do so far.
Amaral must do much more than that.
In the light of clear, documented evidence to the contrary, he must prove that the official record is wrong and he is right about Harrison's alleged role in the enquiry.
If the McCanns and Amaral have Stuart Prior's report, he must be able to show by reference to that report that he (Amaral) contradicted and corrected Prior on interpretation of the forensic evidence, then sent Prior away with a flea in his ear to berate the FSS on the PJ's powers of arrest.
He must show where, in the files, it is stated that Kate sacked a Leicestershire Police liaison officer who asked her where her daughter was.
He must prove that the McCanns set up a fraudulent fund in their (deceased) daughter's name.
He must prove that by propagating the theory as if "fact" that Madeleine is dead, he has not discouraged the search for Madeleine by encouraging the belief (and outright declaring as if fact) that she is dead.
And so on ...