Talk about any suspect will do.
Not "any suspect".
A man whose vehicle was made available for their inspection and a man whose associates might have been well worth following up.
The Swiss police thought it worthwhile enough to alert the Portuguese investigation via Interpol. But the Portuguese were not interested. All that concerned them was getting Madeleine's parents to "confess".
We now know that there was no evidence to justify making either an arguido. Nor was there any evidence against them involving them in any way in the disappearance of their daughter.
If there had been no firearms incident in the Swiss forest with one dead and one wounded ... what evidence would there have been against Von Aesch in the abduction of Ylenia?
Ylenia's clothing and possessions would not have been found and his DNA would not have been found on them.
The Swiss police searched the forest where his body was found and eventually located Ylenia some time later.
Without the unidentified seriously injured man stumbling onto the road to seek assistance and the investigation into that ... I doubt we would ever have heard of Von Aesch or Ylenia Lenhard in relation to Madeleine McCann's disappearance.
The failure of the PJ to investigate the information received via Interpol must surely rank as a far greater omission than their failure to check the twins.
I am amazed that the sceptics posting on this thread are incapable of recognising the dereliction of duty exemplified in this one deliberate omission.
There is little point in deriding the generic "suspect" ... how else do proper police detain perpetrators if they don't look for them in the first instance and ignore all information relating to them??