Unfortunately, I'm not an expert in the mandate of the Auditor General. I would say that, legally, it would have a more direct impact on documenting treaty violations or treaty breaches, but the main difference is certainly the importance that the issue would have in the hands of a commissioner instead of being between the expenses of officers from the transport ministries and all other kinds of examinations. Legally it can be useful to document breaches and relieve the community from that work of investigation.
