Homeland Security chief says that the program is not fully functional, but that security has improved. WASHINGTON -- -- A much-touted, high-tech system being tested along the border with Mexico failed to meet expectations and is being reworked, Homeland Security Secretary Michael Chertoff said Wednesday. Still, he said, border security has improved dramatically. Chertoff said that SBInet, which integrates cameras, radar and unmanned aerial vehicles to monitor the border, did not satisfy his department during initial tests and that he has asked Boeing, the contractor, to make improvements. The remarks came during a wide-ranging and occasionally contentious hearing before the...