After reading testimony (LA's) telling that the odor from the car when it was picked up was so intense and "far-reaching", I'm wondering what could cause that? A dead body still in the car would explain it, of course. And probably a dead body in the car for several days (in the Florida heat) could cause it -- but I'm not sure we can make a strong case that Caylee's body was in the car from June 16 to June 26 or 27 (when the car was seen at Amscott's). I feel this way because Casey was driving the car during that time and had no guarantee that one of her friends might not ask (or need) to ride somewhere with her, etc. Also a big risk that she might be stopped at any time by police -- for example, she apparently ran out of gas on the 20th and an officer or any motorist might have stopped to offer assistance.
If there was a body in the car for a short time, then how did the odor become so powerful? I thought that the stain might explain that, but results from the stain are apparently either negative or inconclusive in some way -- the test results that came back specifically were stated as having been obtained from the hair, not the stain, so at this point I don't think we know for certain that the stain was fluid from a body.
And if the stain in fact is fluid from a body, then how large was the stain such that it might account for the overwhelming odor? I have dug around some on the Internet and have read that the stain was small, and elsewhere that the stain was large -- not sure we were actually told the size.
Last but not least, Casey spoke to Amy on the 25th and again on the 26th about the horrible smell in her car -- if she'd been carrying a body in there, she had to have known what was causing the smell, and so why would she say so much as one word to anyone about "a smell" in her car? Seems like that would be absolutely (!) the LAST thing Casey would want to bring up to someone.