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I've got a question for the security experts here that I need answered for a plot device. For a decade or more all the institutions where I work have given each employee magnetic cards to use on the card-swipe door locks to allow after-hours entry. I have always assumed that the data on what card opened what door when is stored in some security computer somewhere and could be retrieved. Is that true? If so, any idea when that capability appeared and how long the information is stored?
Thanks.
Thanks.