What physical structure could you use to help prevent people from piggybacking on someone else's credentials?

Answer 1

One physical structure that could be used to help prevent people from piggybacking on someone else's credentials is a card reader. A card reader requires the user to insert a card with a unique identifier, such as a magnetic stripe or RFID chip, in order to gain access. This ensures that only the person with the card can gain access, preventing others from piggybacking on someone else's credentials.