Key card

Initially, key cards were used only for access into CTU and into restricted areas, like holding rooms. The key card has changed appearances and uses over the course of 24. Some of the newer key cards also feature a photograph used to identify the key card holder.

Day One
CTU Security Systems Analyst Scott Baylor secretly met CTU Administrative Director Richard Walsh at 2350 Dunlop Plaza and gave him one of the key cards that he had analyzed at Walsh's request. Baylor revealed that the magnetic strip on the card, which could hold a ton of data, contained a file with references to Senator David Palmer. He explained that the hidden file on the key card allowed the user to smuggle confidential information in and out of restricted areas. Walsh knew that the CTU agent who formatted the card was a dirty agent and was part of the plot to kill Senator Palmer.

Baylor was killed moments after handing the key card over to Walsh. Walsh contacted Jack, who arrived to help him escape. As they headed for Jack's car, a sniper shot Walsh, who tossed Jack the key card and instructed him to give it to a programmer named Jamey Farrell to identify the owner and dirty agent.

Jack scanned the card and sent the information to Jamey, who identified the electronic signature. The card belonged to Nina Myers.

NEED SUMMARY OF WHAT HAPPENED NEXT INVOLVING THE KEY CARD - JACK SWITCHING CARDS, MILO, GAINES, ETC.

Day Five
NEEDS TO BE WRITTEN