This is going to prove really useful. With the introduction of (UK) ID cards and iris checks the government can insist that certain services will be available ONLY to those who smile*. Grim-faced personages can be denied access to public buildings, transport and benefits. The government can then prove conclusively that we are much happier in a 24-hour surveillance society.
(* excludes children and employees of H M Government and rich or influential personages)