31.   Two such traces were detected Monday but NATO fighters sent to the spot could not locate the planes.

32.   They will be components in a magnetic spectrometer which will try to detect traces of anti-matter in space.

33.   The fact that the FBI detected no traces of arsenic did not dissuade murder theorists.

34.   The facility will feature new technology aimed at detecting smaller traces of drugs and drug useage over a longer time span than prior tests.