I don't think the state proved conclusively that Casey used duct tape on Caylee. They did not exclude everyone else except Casey to that duct tape. The trunk is a different matter. I agree that the jury dismissed the evidence that there was decomp in the trunk. The state relied on new evidence collection (air samples) as a smoking gun, the same way the OJ trial relied on new evidence collection (DNA) at the time. Both trials resulted in the same result.
I can't fault the jury if they didn't see Vass' testimony as proof there was a body in the trunk. I also can't fault them for not trusting non-experts (GA, car storage guy) when they say it smelled like a dead body in there. I can fault them on dismissing the dogs because that is not new technology, I wish the state emphasized that more.
I wish GA distanced himself more from any accusations the defense threw at him. But it didn't appear that way half the time. He didn't always sound sincere IMO.
Since we never got to open decomp cans thanks to Perry, which I will never understand. The jury needed a shot of real life or death in this case.
I am doing my own collection of decomp and preserving to see if odor molecules will sustain in sealed container.