A just-released study found that a widely implemented, expensive technology to improve mammograms has been a resounding failure. The Chicago Tribune: The study is the latest development in the debate over the usefulness of screening mammograms, which are recommended for all women over 40. Regular mammography has been shown to reduce breast cancer deaths, especially in women older than 50. But the test is imperfect -- it misses up to 20 percent of cancers and often catches things that are not cancer, requiring worrisome and expensive follow-up. Attempts to refine the test have met with mixed results; none has been proved to save lives. The latest study suggests that expensive new technologies should be tested more thoroughly before they are put into widespread use, experts said. The usage of expensive yet inefficient technologies like this helps account for our overpriced health care system.