Testimonies on Friday at the Casey Anthony trial have revealed more information about the infamous car trunk odor.

In July 2008, George Anthony was told that her daughter Casey Anthony’s car was in a tow yard.  When he went to pick it up, he smelled what he thought was decomposing flesh.  When he opened the trunk, it turned out to be a bag of trash. 

Still, he became suspicious about his granddaughter’s fate after that.

On Friday, he testified that he distinctly smelled the decomposition of human flesh.  He recognized it because he was formerly a police officer.

“I had smelled something like that some years prior… That particular smell whenever you smell it, it's something that you never forget. It's a very distinct odor,” he said.

Simon Birch, the operations manager for Johnsons Wrecker Service, examined Casey Anthony’s car the third day it was in the tow yard.  He, too, smelled decaying human flesh.

Birch said he can distinguish between decaying human flesh and other garbage because of his long career in the towing industry.

“The smell came out very instantly … very potent… in the back of my mind, I said to myself that' s the smell of decomposition,” he said.

Casey Anthony is accused of killing her 2-year-old daughter to lighten her personal burden and better enjoy her partying lifestyle.  Anthony’s defense, however, alleges that her daughter accidentally drowned in the family swimming pool.