U.S. to ID departing foreign visitors

DHS is finalizing a project that would collect fingerprints or retinal scans from ALL foreign travelers at U.S. airports as they leave the country.

The idea here is to determine who is leaving the country, and possibly, to determine who is still here (and overstaying a visa). The article does not mention a to scan and print the visitors who leave by car, boat and train. It also does not address the issue of who is entering the country. It would seem logical to do this at entry and exit, no? I mean, do we really care if an alleged terrorist leaves, or enters, the country?

This is a costly program and most airlines have opposed it.

in reference to: DHS readies plan to track foreigners flying from U.S. - washingtonpost.com (view on Google Sidewiki)