21.   On Friday, an official of a private laboratory that tests water said it detected traces of another bacteria in the Walkerton water as far back as January.

22.   Recently, linguists detected traces of it among Liverpool schoolchildren.

23.   Sando said the device was a much more powerful instrument and was able to detect minute traces of drugs, particularly anabolic steroids.

24.   Sophisticated laboratory tests can detect traces of accelerants from even burned materials.

25.   The Czech unit, deployed as part of the allied coalition, reported detecting traces of nerve gas and mustard gas.

26.   The machines can detect minute traces of drugs taken months before urine samples are collected.

27.   The machines can detect lingering traces of drugs from use much earlier than before, up to three months before the test.

28.   The system, being built by the Swedish company Biosensor Applications, would find land mines by detecting traces of explosives inside mines buried in the dirt.

29.   U.S. and British authorities said at the time that they failed to detect any traces of a spill.

30.   The US Food and Drug Administration intends to use the system to sniff scallops at seaports and to detect traces of taints in fish.