passback

From the verb phrase pass back.

passback (uncountable)

1. circumvention of an access restriction to a physical site by passing one's access card to another person after having entered
   • 1988, Security Management (volume 32, issues 1-6, page 107)

     Because each card reader is programmed for either entrance or exit, users must pass in and out before being allowed to reenter, thus eliminating passback.

   • 2003, IFPO, The Protection Officer Training Manual (page 99)

     Modern electronic access systems have many features to enhance the level of access control to a facility, area, or room. Turnstiles, interlocking mantraps, and parkade gates are combined with access readers to prevent passback […]

• antipassback

• back pass, backpass