Colorado has had one at the Douglas County Courthouse in Castle Rock since 2008. They don't tell you what it is, just to get on the pad inside it and raise your hands. I remember the D.C. federal courthouse had one during the Scooter Libby trial.

Pretty soon they will in all public places, including train and bus stations.

Denver International Airport is getting five more, for a total of six, this fall. Here's the TSA's page on "Advanced Imaging Technology"

These machines don't just detect explosives. They detect other things, like drugs. What an end run around the 4th Amendment, particularly if you are not traveling but just going about your business.

More on the types of scanners here.

Full body scanners are just the tip of the iceberg. Here's a new concept that received government certification a year ago:

Top Eye View, Inc.

December 17, 2009 – Top Eye View, Inc. provides the BLN-III “Eye in the Sky”. The Technology is an unmanned tethered blimp designed to operate at low altitudes and provide aerial surveillance. It is equipped with cameras possessing pan, zoom, and tilt capabilities as well as the ability to transmit images and video feed to specified operation centers. This Designation and Certification will expire on August 31, 2014.

And of course, the Government wants all the walls torn down, so law enforcement can share the images amongst themselves. Also approved in 2009:

Xpect Software, LLC

December 11, 2009 – Xpect Software, LLC provides DFuze®. The Technology is a framework by which anti-terrorism operatives collect, catalogue, link images, and share information relating to explosive incidents. The Technology also includes all technical manuals, warranty and maintenance services, and training services, as well as the qualifications of the personnel used for these services. This Designation and Certification will expire on January 31, 2015.

Not one of these machines will stop a terrorist attack. They will, however, blast our already shrunken privacy rights to smithereens.