[Walmart Spies on its customers] The Chicago Sun-Times uncovered a secret study undertaken by Walmart on its customers without their consent. Walmart embedded smart chips in lipstick products which were tracable when the customers left the stores.
Walmart lied and said that it would not be testing the technology on consumers.

The Sun-Times learned of the trial from a disgruntled Procter & Gamble executive and also from the firm that designed the "smart shelf" system. Researchers concealed "readers" in contact paper placed under the shelves and embedded RFID antenna chips in Lipfinity packaging.