Rail operator CSX and Transportation Department trying to have ban lifted.
DEFENSE - ALL ARTICLES
Proposals to loosen immigration requirements could slow action on the legislation.
In wake of scandal at Defense Department, new working group aims to combat abuses in acquisition system.
Agencies must submit plans for incorporating new standards by June and comply by October.
But members of information-sharing councils cite worsening relations between industry and Homeland Security Department.
Investigations found local communities had not received or spent the nearly $14 billion in federal funding allocated for counterterrorism activities.
State Department's Visa Mantis program reduces waiting time from 67 days in 2003 to 15 in 2004.
New approach has advantages over detectors now deployed at U.S. borders, which use either X-rays or gamma rays.