Both sides have been trying to prove "scientifically" by bringing in expert witnesses to testify to the chemical composition of the odor of human decomposition.
The bottom line is: there have been multiple witnesses (both expert & non-expert, human & non-human) that have testified to the smell in the car, and have recognized that smell as the odor of human decomposition.
1. Simon Birch (tow yard manager)
2. GA
3. CA
4. Geraldo Bloise (CSI for OCSO)
5. Gerus (human remains detection dog. Caveat: Gerus hasn't testified, but I trust his training & his nose & I saw the video of him working when he located the drowning victim he was tasked to find)
6. Deputy Jason Forgey (Gerus's trainer & handler)
7. Dr. Arpad Vass (research scientist & forensic anthropologist)
If I was a juror, I would find this list of witnesses who testified to the odor of human decomposition in the trunk of the car to be pretty solid & corroborating to the SA's allegations that little Caylee's remains were in the trunk of Casey's car.
IMO, the DT has NOT been able to undo the testimony of these witnesses.
Speaking as an unofficial *mock juror*, these witnesses' testimonies have had the strongest impact upon me personally.