U.S. Patent Application #20050038718 details the use of RFID readers that American Express calls "consumer trackers" to closely watch people in stores. The idea is that RFID-embedded objects carried by the shopper would emit a "consumer identification signal" when queried by consumer tracker devices in the environment. Businesses would pick up this signal and use it to identify shoppers, track their movements, and observe their behavior.

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In an application reminiscent of a scene from Minority Report, the American Express patent would not only track and observe shoppers, but it would also spam them with purchasing "incentives," advertisements, and even odors:

I wonder how a lack of response to these ads will effect your credit rating.