The Defense's job is to discredit or poke holes in the expert testimony. It would help if it made sense, but it doesn't IMO hide the facts put forth by the prosecution nor does it make the evidence disappear. The State was very thorough in their testing. They took the samples of the bay to rule out anything found in the air sample in the trunk. I'm confused by one thing (ok, a lot!), how does the defense think Caylee was transported after she died in the pool? If Casey' car was used in their scenario (as in George has a set of keys too), wouldn't there have been a presence of decomp. By trying to rule out the "smell" and evidence found in the car, aren't they proving their other statements to be false?