What’s the story with Thermography?

Although thermograms are entirely safe with no contrast or radiation of any sort, they are worthless as an early predictor of breast cancer. A study at Dartmouth around 1980 showed identification of some relatively large cancers with thermography. The principle of thermography is based on minute changes of the skin temperature by an underlying breast cancer generating heat because of the high metabolism of the tumor. In order to be detected by thermography the cancers usually have to be at least two cm (⅔ of an inch), unless they are very close to the skin. In the past 35 years this technology has been surpassed by other imaging. Because the procedure is safe and since it was in use by 1975 it was grand-fathered in as an allowed medical procedure by the FDA....