Escape mechanism for location-based services

As stated by Roy Want and colleagues in 1993 in their paper that describes "The Active Badge Location System"

"there will always be some days when for whatever reason somebody does not wish to be located. The location system tracks badges and NOT people. Anybody wearing a badge can remove it and leave it on a desk. The Active Badge system will then be misled into locating that person in an area that has been chosen for this deception. This kind of escape mechanism is not an undesirable system feature and may be an important factor in making this system acceptable for common use. "