So don't you believe Grime when he says his dogs cannot distinguish between the scent from a dead person or the same scent from various body bits and bodily fluids from a live person?
If Eddie had spent the same amount of time in other apartments/cars as he did in 5A and the Renault - he may have alerted in one or more of those other places. Or conversely, if Eddie had only been allowed to spend the same small amount of time in 5A and the Renault as he did in those other places, he many not have alerted in 5A or at the Renault.
For example:- After 30 seconds (i.e. the maximum time spent on the other cars) Eddie had not alerted. After 30 seconds spent on the Renault the result was the same - Eddie had not alerted.
Unless the same amount of time is spent at each site/object - then clearly the tests cannot be regarded as unbiased.
Eddie can't distinguish between the body of X and the body of Y. He can't distinguish between the scent of X's remains, discovered after days, and the scent the remains of X left where X died, before X's body is taken to the incinerator.
About the time to spend here and there, I'd leave it to the experts if I were you, Benice.
This is far to be the first time you're spreading the subliminal myth that Mr Grime and Prof Harrison crooked the Portuguese Justice !