WASHINGTON, July 3 (UPI) -- Technical limits and privacy concerns are plaguing the system designed to protect the U.S. government's computer network from cyberspies, officials said.

WASHINGTON, March 10 (UPI) -- The official in charge of coordinating the U.S. government's cybersecurity operations has quit, saying the expanding control of the National Security Agency over the nation's computer security efforts poses "threats to our democratic processes."

WASHINGTON, March 9 (UPI) -- The U.S. Department of Homeland Security plans to study the possibility that human body odor could be used to tell when people are lying or to identify individuals in the same way that fingerprints can.

WASHINGTON, Feb. 24 (UPI) -- The Department of Homeland Security has contingency plans to surge personnel and other resources, including the U.S. military, to parts of the southern border if law enforcement agencies on the ground are overwhelmed by the spillover effects of escalating criminal violence in Mexico, department officials say.

WASHINGTON, Feb. 18 (UPI) -- A Democratic senator and chairman of a key terrorism and homeland security panel says he is dissatisfied with the answers he's received from federal officials about the surveillance of Maryland peace activists.

WASHINGTON, Jan. 7 (UPI) -- New security policies instituted by the Bush administration requiring new types of electronic records from businesses hurt competitiveness, critics say.

WASHINGTON, June 20 (UPI) -- Although the risks of an outbreak from a proposed new U.S. secure bio-defense and agricultural disease research lab are very low, the consequences would be worse at one of the mainland sites officials want than on the island where the work is currently done, says a draft report from the Homeland Security Department.

Expert assessments of the biggest terrorist threats to the United States differ slightly, but they all emphasize the need to be ready and combat complacency.

WASHINGTON, Oct. 4 (UPI) -- The U.S. Transportation Security Administration will use heat-sensing cameras to spot potential suicide bombers attempting to board trains and buses.