What Have I found the smoking gun?
"Finally, the fact that, despite all that confusion and all that noise, the twins continued to sleep, as mentioned by GNR Officer José Maria Baptista Roque, a member of the patrol that was first to arrive at the apartment "the children never woke up, remaining in a ventral decubitus position, not moving during the search and afterwards" [28], remains unexplained. Nevertheless, a Team from the Criminal Police Lab, on the 4th of May 2007, eliminated the existence of any product that could have been ministered to the missing child, in order to maintain her in a state of unconsciousness, as well as the presence of blood traces.
What does that mean - did the police actually do tests, but on who and what are these blood traces being spoken of? I've never heard of blood traces being found on the 4th. Not quite the same as taking blood samples from the twin siblings.
Later in the same document it states "The PJ specialist team, which went to the site to collect evidence, excluded the existence of any product that could have been administered to the missing girl in order to maintain her in a state of unconsciousness nor the presence of blood traces.
So basically they didn't find any chemical traces or blood traces, but they still didn't consider whether they thought the twins were doped either.