The victim was Madeleine.
Good of you to recognise that.
However two of the other victims of the crime ... Madeleine's siblings ... were apparently ignored by the police investigators both regarding their personal welfare and their importance as possible vessels carrying evidence.
There is no record of any forensic investigation concerning their persons, the cots they slept in or the bedding on which they slept.
Indeed, they were carried from the scene of the crime wrapped in bedding which could have been evidence.
In the meantime the other victims ... unless you wish to argue the point about who exactly are the victims of such a crime ... have somehow been metamorphosed into investigators responsible for the crimes scene, from as some would have it,
- sealing off the crime scene
- to ensure that proper diligence regarding the observance of collecting forensic evidence is observed
The police do the investigating. I do not believe that even Amaral's theory stretched as far as suggesting any suspected drugging of the twins should have been left to their parents to instigate investigating ... do correct me if I am wrong.