Abstract: A tagging system for persons or objects comprises tags to be carried by the person or object, each tag transmitting a signal carrying a unique identification code and preferably including a smart card for the purchase of goods and services. A first type of tag detector is arranged at entrances to areas and detects signals from tags passing through the entrances. The detection region of this type of tag detector is limited to the region of the entrances. A database holds information from the respective persons or objects and the unique identification code of the tags being carried by the persons or objects and it receives and stores information on the use of the areas by the person. An entrance processor processes the detected signals to generate an invalid tag signal if a received unique identification code is invalid. A second type of tag detectors is provided for detecting signals from tags in the areas.