Anti-passback

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function that stops a single token being used to enable more than one person to enter a facility or to enter multiple facilities. To prevent ‘passback’ the entry system must not let a token be used to gain access more than once without the token then being registered as having left the area. For a fully secure system, anti-passback and anti-tailgating should be combined to prevent both multiple uses of token and multiple entries on a single token transaction.

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