Customer-tracking tactics move to brick and mortar

"Privacy is dead--get over it," has been a mantra of private investigators for years. But continuing revelations about how many different ways personal privacy is still disappearing are still enough to unnerve people. It is not just about the trail everybody leaves from the websites they visit, or from security cameras in public places. It is also about smart cars. It is about the cellular towers that serve their smartphones. And it is now also about their friendly brick-and-mortar retailer. One...