31.   Is waiting for people to fall ill the only way to detect the presence of anthrax spores?

32.   It also called for a fully validated testing procedure to be available to detect the presence of a genetically modified crop in food.

33.   More important, ProstaScint was able to detect the presence of small volumes of cancerous tissue not detectable by standard methods, researchers said.

34.   Now it appears that PET can detect the presence of metabolically active tumors and may be able to indicate whether and how far the cancer has spread.

35.   Operators in the van use a number of scientific devices to detect the presence of bacterial cells in the sample.

36.   Sinks, toilets and urinals in many public restrooms use infrared sensors to detect the presence of a person and activate the plumbing.

37.   Somehow, however, Waddle failed to detect the presence of the Japanese fishing boat and hit it as he surfaced.

38.   The devices aid in night driving, detecting the presence of animals or even people on the road and then alerting drivers.

39.   The infected crows found in Staten Island were identified as a result of a regional effort to quickly detect the presence of the disease.

40.   The Murex rapid test does not detect the AIDS virus, but rather detects presence of antibodies, or proteins, that form in response to HIV infection.