Corrected entry: The pass cards for the complex where Jennings works have what appear to be a bar code along one edge. During most (if not all) closeups of the pass cards in use, that code is swiped through the reader (ie, the edge with the barcode is closest to the wall). However, when Jennings uses the card for the first time (after creating the metal detector diversion), that edge is on the bottom (closest the floor) and is not swiped through the reader, yet the door still unlocks.
Gabbo
5th Jan 2004
Correction: I work at a large company and we use access cards with bar codes on them. Although we do swipe them for access the swipe is for the internal chip, NOT the bar code. The bar code is used by security guards with a scanner.