George Houston, an officer with the San Francisco Bay Area Rapid Transit District, and Timi, an 18-month-old German Shepherd Dog, hurry into a terminal at Atlanta’s Hartsfield-Jackson International Airport. The team must locate two explosive devices in less than 10 minutes.

Houston turns and begins walking backward, guiding Timi with the leash and pointing to where he wants the dog to sniff. Timi sniffs hurriedly around ticket counters, garbage cans, and chairs. Suddenly, the dog stops and sits slowly in front of a chair. Houston looks and finds an explosive device strapped to the back of it.

"Good dog,” says Houston, who tosses Timi a red rubber Kong toy that bounces erratically across the floor. Timi pounces on the toy, but playtime only lasts a few seconds. There is still another bomb in the terminal.

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