http://www.geigercounters.com/index.htm
A unit with a pancake GM tube?

A robot that detects the ad starting and presents the users with a few mins of a fitness game, word/number puzzle, the internet or other computer game?
Sell it as a fitness/brain helping lifestyle product.

Yes its a computer device with a function in your home. New laws in this area could flow both ways. If data belongs to someone down to the end device, would user data get the same broadcast television protection on any device?
Free on the web "ecosystem" could get very interesting if all you could do is sign up for an encrypted walled garden.
Or spend a few mins on every new website clicking EULA for every cookie, flash cookie, 3rd party script, allowing web 2.0 to deep search every message, txt, email...

Yes at some point the US must have allowed its vision to shift from nuclear shielding to very adaptive hardware and software.
With that change Soviet methods could be countered on one airframe with the change of a device, not a total new aircraft.
Russia was stuck with hardware, the US could update software as needed.

Its the data that could be vital. A simple bbq pic of a group of older men and woman that?
With DHS, fusion centers, a lot of interesting federal people are now mixing with local police forces.
People with histories in Africa, South America, Asia in the 1980's, 1990's.
Playing coloured traces games with Russian 'advisors' by night, helping clear Communist villages by day.
You could have 100 of years of combined US experience and long term mil training exposed on a simple picture.
Or one undercover who just retired.

Epidemiology is not very hard for many cash poor nations to try and set up.
Some parts of the world, e.g. ex Soviet nations don't seem to like/support the idea very much, but it should be very easy to do in Japan and the areas around Japan.
So its as easy as selecting a wide pool of people and testing them at set intervals over many years.
Counties around the world do it all the time with generations of results in known populations e.g. food, cancer, twin studies.

They want legal cover and immunity. The ability to share the info, keep it, track it.
No "walking" to court years later.

http://www.youtube.com/watch?v=F90wnuWo6jk
Shows the driver face capture, plate capture, passenger face capture and network link on one small roadside camera setting.

In Australia you where meant to buy a car or 2 or 3 and drive to work or use rail/bus (with cars for weekend/shopping).
The main aspect driving classic Australian urban design was import costs and keeping the local car industry employing 1000's.

His team analyzed the geometry of all of the subway networks in the world that possess more than 100 stationsâ"including Barcelona, Beijing, Berlin, Chicago, London, Madrid, Mexico, Moscow, New York City, Osaka, Paris, Seoul, Shanghai, and Tokyo i.e. no Vienna