This document discusses privacy issues related to frequent buyer programs used by grocery stores and other retailers. It notes that while these programs aim to profile customers' purchasing habits to target them more accurately, they also collect a large amount of personal information from customers. This information could potentially be misused, such as being used against individuals in criminal cases, sold to third parties without consent, or stolen through data breaches, violating users' privacy. The document examines technologies like loyalty cards and electronic toll payments that facilitate data collection and the risks they pose to customer privacy.