11.   Although the technology to sniff out explosives exists, it is expensive and has a limited usefulness.

12.   Among the most unusual projects is one at the University of Montana to train bees to sniff out chemical or biological agents.

13.   And law enforcement must walk a thin line between sniffing out extremists bent on violence and preserving individual rights.

14.   As a result, the Nomadics device, called Fido, was the first artificial nose capable of sniffing out a land mine in the real world.

15.   At the request of the New York City police, the state police brought in a German shepherd that had been trained to sniff out corpses.

16.   B. BEETLES SNIFF OUT FOREST FIRES A species of beetle could sniff out forest fires and even help protect storehouses and public buildings from fire.

17.   Back at Mulholland, turn right and sniff out your vehicle.

18.   Before sniffing out dim bulbs on her quiz show, Robinson sniffed out corporate fraud.

19.   Beagles at Kennedy recently sniffed out a partly stuffed cow head arriving from Argentina.

20.   Blacklin was spotted by a dog specially trained to sniff out narcotics and other controlled substances among international passengers at the airport.