In the wake of the September 11 terrorist attacks, the Bush Administration authorized the National Security Agency to eavesdrop on American citizens and others without a warrant. Congress officially legalized this once-secret program with the passage of the 2008 amendments to the Foreign Intelligence Surveillance Act, but civil libertarians claim that warrantless wiretapping is unconstitutional. The Supreme Court has just agreed to hear a case on this very issue. Adam Liptak, Supreme Court correspondent for our partner The New York Times, explains what's at stake.

It took federal investigators only 53 hours to locate and arrest Faisal Shahzad, the man accused of attempting to set off a car bomb in New York’s Times Square area.  

For this week's tech segment, we're looking at surveillance as an aid to terror investigations. How effective are video cameras and other surveillance technologies in catching criminals after the fact (or preventing crime in the first place)? And are some surveillance methods better than others? We talk with two experts.