The further development of enzyme assays demonstrated that levels of hexosaminidases A and B could be measured in patients and carriers, allowing the reliable detection of heterozygotes.

Critics say that improving the accuracy will permit more reliable detection of trends in deaths from various diseases.

Range of the radar was estimated at between 200 and 300 miles (322 to 482 km), with reliable detection of bomber-sized targets at 100 miles.

However, the narrower the beam, the less time it spends painting an object as the antenna spins, meaning that it may not make reliable detections.

With a narrower focus, it can be more straightforward to obtain reliable detection.

The first reliable detection of a ring was made in 1968 by stellar occultation, although that result would go unnoticed until 1977 when the rings of Uranus were discovered.

Allowing 1% error either way, a 1% maximum tolerance in measurement would mean a reliable detection of growth after half an hour.

There are also some local variations in the measurements and because of this reliable detection of growth over a period of half a day seems unlikely.

Subsurface threats are a difficult problem, because reliable detection is available to date chiefly by use of high-resolution active sonar or trained dolphins or sea lions.

"The releases at Kamisiyah suggest the need for a thorough investigation of other sites for which reliable detections exist or where information indicates cw agents could have been present."