Don't you see?
By reclassifying cannabis as class b it now becomes a chargeable offence to possess it. Now, any chargeable offence results in your DNA being nicked (er, collected) and added to the governments huuuuge database.
Now that the ID scheme is approaching tatters (if not already there) good old Gordo is creating more ways to make everyone a criminal and grab their most intimate physical info that way.
The Alien because they're Gordos bosses and they WANT that database to engineer a docile, mindless slavehttp://www.theregister.co.uk/Design/graphics/icons/comment/alien_32.png
Alien population for the next generation.