Dave Bullock has a pair of great galleries from this week's Homeland Security Science & Technology conference in L.A. (I was supposed to go, but the wife vetoed the trip.)
The first tracks homemade explosives. Here's an inert replica of one of Unabomber Ted Kaczynski's letter bombs.
The second looks at spy gear and police tech. Here's a portable spectrometer that can ID a chemical agent in 30 seconds.
