Day 8: 7:00 A.M. - 8:00 A.M. - S8-E16
Character mistake: When the exit guard puts Dana Walsh's ID card in the computer it comes up with "apprenhend on site", which should obviously be "apprehend on sight". (00:09:45)
Day 8: 12:00 P.M. - 1:00 P.M. - S8-E21
Character mistake: When Chloe is talking to Arlo about the call Jack made to Meredith Reed, Chloe says that the call was made to Meredith's cell phone. But at Meredith's office, a coworker tells her the call is waiting (implying Jack called the office instead of Meredith directly), and once in her private office, she picks up the receiver of her land line. With all the phone tracing technology CTU has at its disposal, Chloe should be able to distinguish between the two.
Answer: According to Jack in season 5, Nina was "deep cover" before the pair ever met, so it's safe to assume she was recruited before she joined CTU. As for what her primary mission was, who knows? Perhaps it was to gather sensitive intel and pass it on to her superiors. Given that she worked for an intelligence agency, it's not a stretch. Or perhaps we may find out in season seven.
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