Tailgating in plant security refers to which behavior?

• A. Using a second card to gain entry when someone holds the door
• B. Following a worker through a security door without using the card reader
• C. Waiting for a door to be fully closed before entering
• D. Locking doors behind you after entering

Answer: (B)

Tailgating is when someone gains access by following closely behind an authorized person through a secured doorway without using their own credential. This matches the described behavior of entering right after a worker and not swiping a card at the reader. It bypasses the individual authentication step, creating a security gap in the access control system. While using a second card or badge to enter is a different form of credential misuse, tailgating specifically focuses on entering without presenting your own credential. Waiting for the door to fully close and entering, or locking doors behind you after entering, are proper security practices that prevent tailgating.