Just because it isn't recorded in the files that we have access to doesn't mean it didn't happen. There must have been hundreds of conversations going on between various people during that time that have not been mentioned in the summaries.
We do know that on the 5th May the FLO's were asked to make enquiries to the PJ on the McCanns behalf re the possibility of drug use. I doubt if the FLO would make that claim if they didn't carry it through. What we don't know is whether they got a reply or not. If the PJ did not reply - would they want that fact to enter the public domain? Is there a statement somewhere that was not released. Who knows
What we do know is that we only have access to SOME of the overall information known to OG and the Oporto team - and we have no idea what has been held back or why - which is why I think it's a mistake to keep coming to conclusions as if we do have ALL the information - when we clearly don't.
It may be that many of the 'debates' we have on here are subjects which SY and the Oporto team do not have to query or investigate - because they already have the answers in the files that we don't have access to.
AIMHO
Just because something was written in a book years after the event doesn't mean it did happen, either. Particularly when the witnesses who were being addressed seem not to have heard it.
The FLOs were asked a specific question which was if the PJ had any evidence that Madeleine had been drugged. Whether that question was asked or not, or answered or not doesn't matter because we know the answer was no.
Some files were withheld by the Portuguese and we have been told what they are, there's a list;
http://www.mccannpjfiles.co.uk/PJ/MISSING_PAGES.htmSince then the PI's, OG and the PJ have taken other statements and carried out other investigations, but they are unlikely to contain new information about a conversation between the GNR officers and Kate McCann on the night of 3rd May. The GNR officers and Silvia Batista didn't report the conversation in their statements to the PJ, so it's unlikely they remembered it later.