There is no definitive evidence, however, to show that this screening can reduce mortality.

The companies say screening has sharply reduced the cost of liability insurance.

Mr. Gore said the screening would reduce the number of bags that required scanning for explosives.

A study announced here today provides the first evidence that routine screening of men for prostate cancer can substantially reduce the deaths from the disease.

Based on fair evidence, screening does not reduce mortality from lung cancer.

The evidence is inadequate to determine whether screening reduces mortality from lung cancer.

More recent studies have shown greater effectiveness in how screening has reduced the prostate cancer death rate.

Aside from the major finding that screening did not reduce lung cancer mortality, several other important facts were uncovered.

The screening reduced breast cancer deaths by 39% in women aged 50-69.

Professor Becker said he hoped the screening of potential immigrants for terrorists would not reduce immigration.