I know someone upthread mentioned that drugs could have different affects than expected when ingested by children. This is definitely true. My 4 year old is on oxycodone daily (low dose, due to severe chronic illness) and has been on morphine, vicodin, dilaudid all at some points in the recent past after surgeries. Whereas these pain medications would make me loopy, knock me out as they do most others I know, they make him hyperactive. It's not unreasonable to think that stimulants (cocaine, meth) administered to little bodies that are in no way able to handle them could actually pacify them, put them to sleep, etc instead of making them hyperactive as one would expect.
I called CPS several years ago on a mother in my neighborhood who was an alcoholic, dropping her 1 year old daughter in the yard while stumbling around drunk, etc. When social workers arrived just for their first visit to lay eyes on the children in the home, the 1 year old was lethargic, could not keep her eyes open, etc. They removed the girl immediately and drug tested her and she tested positive for cocaine. This happened in my little quiet, suburban neighborhood-we were all shocked. I am not surprised to hear this 3 year old tested positive in this situation, so sad.
It's entirely possible to me that the drugs were given to the child to make her sleep, make her lethargic and out of it, etc. Or she could have very well just gotten into these chemicals that were laying around the house, who knows. We have seen videos parents have posted on the internet of laughing while their young child is high on ecstasy, showing and encouraging their young child how to smoke a blunt and even administering IV street narcotics to their children so, nothing is out of the realm of possibility here, unfortunately. Very sad. The quote about using the FBI lab does tell me that law enforcement has significant evidence with DNA, etc and they are pretty sure what terrible fate befell little Leona.