The regulation would have to be based on solid risk assessment, as it is in the countries I named, which are well advanced in this, both in the science of risk assessment and the application and regulation. They are Australia and New Zealand, which have ministries or departments of biosecurity. They take this issue very seriously because they recognize it as a national security issue.
When you consider how much invasions cost the world, something like 5% of the GNP, that's a large tax on global economies. But they are aware of this, and they have strong political will among their public to do something about it, regardless of which government is in power.
I would look to them as a model. It has to be based on risk assessment. The regulation has to be coupled with a scientific assessment of the threat, which changes over time.
The people to talk to about this are the people I mentioned, Nick Mandrak and Becky Cudmore, in the Department of Fisheries and Oceans.