Amaral admitted the PJ should have requested tests and that it was THEIR mistake not to do so. However in the absence of any confirmation that no drugs had been used - he was then able to make nasty insinuations against the McCanns (Kate in particular) implying that all of the children (including Madeleine) had been drugged - as follows:
Quote from his book.
While the grandfather stated on television that Kate gave Calpol to the children to get them to sleep, several months have gone by since May 3rd. Kate, who is a doctor, must be aware that the time for obtaining convincing results has largely passed.
It is known that the sudden withdrawal of sedatives can cause sleep problems. If Kate's journal is to be believed, the twins suffered from problems of that nature during the days following their sister's disappearance.
Unquote
IOW :
1. He claims the children were given Calpol to make them sleep.
2. He insinuates that Kate deliberately waited for months until she knew the results of testing would not be 'convincing' before raising her concerns.
3. He insinuates that the twins showed signs of sudden sedative withdrawal.
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It's inexplicable to me that some people can read such lies and distortions of the facts such as those above (which is only one small example from his libellous book) and actually wonder why the McCanns decided to sue him.