Absolutely, while it is possible to enter their statement of facts as evidence for a Canadian prosecution, the fact is that the charges laid in the United States were under U.S. law and weren't the same as what was pursued in Canada under the Canadian Environmental Protection Act.
The testing of vehicles is certainly one component. There's also the investigation of the defeat devices themselves, which actually required some level of reverse engineering in Canada because it was not to simply demonstrate that the vehicles were not performing the way they were expected to, but to show that there was a device that was designed to do this.
I may actually turn it over to Monsieur Couroux to speak a little bit about the technical aspect of testing, as well as the facts about the co-operation with the U.S. on testing.