... abuse.¹

Indeed, at least in one case a man stalked his former girlfriend aided by a GPS device and digital cellular transmitter mounted on her car [1].

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... aisles.²

In fact, the IBM Footprint research project [16] developed an inexpensive $10 infrared sensor. An array of such sensors allows stores to measure the effectiveness of their store design by tracking the path of customers through the store. For example, it reveals whether promotional items are effectively placed, whether customers stopped to look at promotions, or how long customers had to search for a specific item.

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