See also:
National License Plate Recognition Database
General Services Administration ^ | Feb 12, 2014 | Department of Homeland Security
Posted on Thursday, February 13, 2014
http://www.freerepublic.com/focus/f-chat/3122555/posts
The solicitation is no longer at FBO. A copy is available here:
https://eff.com/fa/document/dhs-national-license-plate-reader-database-solicitation
Although the solicitation was terminated it is interesting to read, page 4 for instance.