This week's guests:

• Former Homeland Security Sec. Michael Chertoff.

• Jacob Goodwin of Government Security News on the NRC's plans to distribute potassium tablets around U.S. nuclear plants.

• U.S. Rep. Eric Massa (R-N.Y.) on border violence and the drug war.

• Gautham Nagesh of NextGov.com on the federal government's search for advanced security tools to thwart hackers.

• Peter Huessy of the National Defense University on the North Korean missile controversy.

• Jeremy Kirk of IDG News (London) on the growing ranks of cybercrime police.

• Bob Poole, director of transportation policy at Reason Foundation, on a plan to arm pilots.