[aarongough]

Care was taken to make sure these invasive species didn't get imported in the first place, but clearly that didn't work... What makes you think preventing the altered species from being transported back will be any more successful?

[fouric]

Because we somehow managed to _not_ import them for several decades/centuries before one finally slipped through, and we only have to avoid exporting them until they die out, which sounds like it would only take a few years.

[tptacek]

Obviously, we managed to _not_ import them during eras where travel and trade between continents was far rarer.