As stated earlier in the upthread, the FBI did not receive the same sample as Dr. Vass so that would not be a true analogy of their reporting. Had they then switched the samples between themselves and retested, I think the chloroform evidence would have held up. But......always a but, I know.....I don't think it came from anything FCA made, I believe because the chloroform levels (in the carpet) were different according to which part they took the sample from, that Dr. Vass got the section that Caylee's body was in contact with and the FBI did not. That would explain the fluctuations.
I was watching the story of Sandra Cantu the other evening and found out that after administering a drug to make her drowsy, that she (Melissa Huckaby) used plain old "rubbing alcohol" on a rag that displaced all oxygen and held it to her face until her heart stopped beating. I did not know until then that "rubbing alcohol" displaces all oxygen and you can asphyxiate someone that way. My thoughts then ran to this case with that information. It's possible that the chloroform was the byproduct of the decomposition and that's all. Not to diminish the seriousness of its' presence, but maybe looking at the presence of it as a murder weapon is where the biggest error was. Possible something as simple as rubbing alcohol and then duct tape would accomplish the elimination of an unwanted child. I'm leaning toward this act occurring in Caylee's room during naptime, then carried to the car and put into the trunk. The duct tape, I believe went on the next day while the car was backed into the garage.
Just thinking out loud.