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For a behind the scenes video of staff photographer John B. Carnett's photo shoot with the LASD, check out the video at the bottom of this page. And for a gallery of the latest and greatest crime-fighting gadgets, click here to launch the gallery.

It´s a sweltering Saturday afternoon in late August, and I´m crouched beside a run-down house in East L.A. with Commander Sid Heal of the Los Angeles Sheriff´s Department. Rather than peek through the window and expose his head, Heal points a boxy-looking device at the side of the house and flips a switch. A grainy image of a man inside appears on the device´s screen. Heal and I watch him walk across the living room, enter a closet, and crouch down.

We´re not on a stakeout, exactly. More like a shopping expedition. As head of the LASD´s Technology Exploration Unit (TEU), Heal is hunting for a gadget that can see through walls. Standing behind us, Avrom Gilbert, a representative with Camero, the Virginia-based company that makes the radar system, explains how it works. It relies on ultra-wide-band radio waves to penetrate wood and concrete. Complex 3-D computer software processes the signals and generates an image.

The device seems miraculous to me, but Heal has the manner of someone sizing up a used car. He peppers Gilbert with questions: How long does the battery last? Can it be recharged from a vehicle? How much training is necessary? How many seconds does it take from unpacking to getting a useful image? Can the metal often found in California stucco cause distortions?

Heal, 56, is the LASD´s technology guru, charged with procuring futuristic crime-fighting equipment. In a post 9/11 world, police work is more complicated than it used to be, and the traditional handcuffs and pistol aren´t enough anymore. In his 10 years with the TEU, Heal has tested hundreds of gizmos, including stink bombs, pain beams, a bullhorn that can project sound up to two miles away, spy drones, a microwave emitter that can stall the engine of a fleeing car, and blinding LED strobe lights [see the gadget gallery here].

Part of the need for new equipment stems from the changing role of law enforcement. â€The line between war and crime has become blurred,†Heal says as we drive away from the house. â€Police officers are now expected to prevent and respond to terrorism. Soldiers are asked to guard prisoners and investigate crimes. Street cops have sub-machine guns.â€