Explanations of the difficulties encountered in translating accurately have been provided by the translators themselves by way of notes in the statements - and have been posted on here more than once..
Evidence of how Kate's diary was mistranslated - causing the opposite meaning of what she said to be wrongly made public have also been posted,
It's obvious to me when reading some of the statements that the wording chosen by the interpreter, although strictly speaking may not be incorrect - is not a word /phrase that the interviewee would use in normal everyday conversation.
Sometimes there are several words all with slightly different meanings which can be used to explain one word. IMO an example of that is the word 'monitor' which can mean 'checked' - but the word 'checked' can also mean 'controlled' - which does not mean 'monitor'. That one example itself has been the cause of much controversy over C.Mitchell's role in the media.
It is very telling IMO that the McCanns paid £100,000 to have the files professionally translated.
Quote from Kate's book:
By the Sunday evening, we found ourselves giving our statements again, this time to a couple of detectives from Control Risks. We were concerned that parts of the statements we had made to the Portuguese police, especially on that first day, might have been lost in translation. We also felt that these accounts were not sufficiently thorough and wanted to have every detail we could remember registered properly. Unfortunately in our haste to pass the new statements on to the PJ, we made the mistake of assuming that the transcripts would be correct and discovered only many months later that these, too, contained inaccuracies. And they had been given and recorded in English! A word of advice, in case you are ever unlucky enough to find yourself involved in a criminal investigation in any country: always make sure that you read your statement, in your own language, after you've provided it.
End quote
One wrongly translated word can make a huge difference to a statement. IMO The idea that errors could not have occurred because the interviewees signed statements as being correct is naive. IMO it is proof that folk are human and will and do make mistakes - especially if their statement has been read out to them at the end of long tiring interrogations, and they have not had the opportunity to sit and read it themselves in their own language when they are refreshed.
All in my opinion, no-one is obliged to agree with me.