Excluding the aliens

It does not seem to be a very friendly attitude. But if it is absolutely necessary to keep out the nastier beasties, then I can live with it. The Executive has announced:

Halting the invasion of alien species
28/02/2007

A new way of dealing with the threat to Scotland's native wildlife was published today for consultation.
The draft Invasive Non-native Species Framework Strategy for Great Britain will minimise the threat from invasive non-native species.
Invasive non-native species are the second biggest threat, after habitat destruction, to native species and habitats worldwide and the greatest threat to fragile ecosystems such as islands. They can also have a substantial economic impact across a wide range of sectors such as fisheries, forestry and development.
The Strategy provides a framework focussing on prevention, early detection, and mitigation measures where appropriate. The Strategy will be followed by a separate implementation plan that will be developed with a wide range of partners.

I suppose that a framework strategy and an implementation strategy are bureaucratic necessities? We could not simply track down and then deport or kill the invaders?