What are “dense breast laws?”

Women in many states have complained to their legislators that they developed malignant lumps in their breasts that either they or their health care provider found shortly after a mammogram and after receiving a letter from their radiologist assuring them that their mammogram was normal.  No mention was made that because they had dense breasts they could not be given complete assurance that their breasts were cancer free. In response to this problem, the legislatures in five states, including the three largest states, California, Texas and New York, have passed laws that the radiologist must inform women who have dense breasts and a normal mammogram that there are other tests such as ultrasound and MRI that can find cancers that are missed by the mammogram in...