The scent was escaping through the passenger door seal. He didn't sniff the boot seal but went underneath the boot twice.
"the passenger compartment of your car is not designed to be airtight."
"I recognise this behaviour as the dog indicating scent emitting from the inside of the vehicle through the seal around the door." (MG)
Eddie alerted at the driver door, not the passenger door. He was directed to the passenger door and did not alert. He did not alert at the boot door.
Martin Grime may or may not be right in saying this was due to the seal on the driver door.
If the Scenic was deliberately fitted with non-porous seals, then Eddie should have alerted at the passenger door, and probably at the boot door. Therefore, I conclude that it is not deliberately fitted with porous seals.
That leads me to conclude that IF Martin Grime is correct THEN the driver seal may have been faulty.
However, there is an alternative explanation.
Before Eddie alerted at the driver door, he ran back and forth between the Scenic and the garage ventilator, suggesting that there was a scent trail between the Scenic and the ventilator.
Now consider the set-up of the test. Along with the other 9 vehicles, the Scenic was driven into the garage and parked in what was deemed to be an appropriate slot. So we know for a fact that the driver door was opened once when the driver got in and once inside the garage when the driver got out. It may have been more openings and closings but I neither know nor care.
The result fits the dog's pattern, of a scent stream form the Scenic to the ventilator, with the strongest point being around the door.
If the passenger door of the Scenic was not opened and the boot was not opened (and why would they be?), then there would be no scent around these parts, hence no alerts.
Try reversing this. Assume my explanation above is incorrect. Assume Martin Grime is correct. Without that faulty seal, the test should have failed i.e. Eddie should not have alerted, just run round in a tizzy between the Scenic and the ventilator. Then Keela would not have been deployed.
And endless years of argument over the dogs would have had much less fuel.
It wasn't the best-thought through experiment. All of the vehicles should have had windows down or doors open to ensure interior smells were available at the exterior.