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Tailgating (or piggybacking) is a physical security failure wherein an unauthorized party enters a facility by closely following an authorized party. Which physical security control is designed to defeat tailgating?
Bollards
Contraband Checks
Turnstiles
Smart Cards
Turnstiles prevent more than one party from passing through a given space at a time. They are somewhat susceptible to defeat in simple implementations as seen in subways, but if implemented correctly, can mitigate risks associated with tailgating. EDIT: Don't put tailgating and piggybacking together as if they mean the same thing. The difference between the two terms is that piggybacking implies that the person who has opened the door with their credentials knows that others are following them in through the secure door. Tailgating means that others are following through the door without the knowledge of the person who has opened the door.
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