I can't answer the question directly, but what I can say, as Madam Brown pointed out, is that originally the new Quarantine Act referred to a broader set of conveyances. It's certainly conceptually easier to talk about marine, air, and ground. There are three large types of conveyances. Even if we're talking about space one day, they would presumably come by air. So we've pretty much covered everything.
It's quite clear, right now, that the ground conveyances have been taken out. If we summarize what we're hearing here today, it's a balance of a number of factors. There is the evaluation of the current risk with respect to the land conveyances, the balance of the burden on the operators, the burden on the program, and the international comparisons. Then any prescribed conveyance allows the government to deal with a problem if the risk—