There were no benzos found in Caylee's hair. Those where the test samples.
ITA though about the over-kill.. very odd for someone like Casey. Lazy, no follow through, fly by the seat of her pants.. can't sneak, lie, steal or even sign a bad check "properly". Claiming to be a virgin at 7 months pregnant, was held up with a gun to her head at her 2nd job.. the only people foolish enough to fall for any of her games were her "family" (and we know now that they were not even fooled they just chose to shut up to keep the peace in the house.)
I dunno, I just do not see the same person many here see. The chick is hardly a mastermind. imo.
ITA...She was motivated by whatever was convenient at the time. I think that her friends talked about chloroform more than we realize so far. There is a hint of that when we saw that there was a "joke" regarding chloroform and dating going around on MySpace...