Beginning Friday, shoppers at more than 6,000 drugstores across the nation will be able to pick up a test to scan their genes for a propensity for Alzheimer's disease, breast cancer, diabetes, and other ailments. The move is being welcomed by those who hope that deciphering the genetic code will launch a new era in biomedical science. But it's being feared by those who worry it will open a Pandora's box of confusion, privacy violations, genetic discrimination, and other issues, the Washington Post reports.