Expectations of privacy...

[SamIam]

Various agencies have already been tracking people by their cell phone use, so the GPS thing is just a refinement on what law enforcement has already been doing.

Now DHS wants to build a better mousetrap in the form of a "Federated Information Sharing System." That should be fun. What 4th Amendment?

In an effort to enhance DHS’ information sharing capabilities, the department is looking to construct an integrated database known as the “Federated Information Sharing System,” a move which has raised concerns from the American Civil Liberties Union.

Currently data is restricted to individual systems within various DHS components which were created to fulfill specific mission requirements.