Visible crew/equipment: When David is talking to his daughter, just after the remark about there being nothing to worry about, a camera moves into shot on the right hand side of the screen. (00:08:50)
Visible crew/equipment: As Kim runs over to her friend at the end, a camera shadow can be seen on her arm. (00:41:00)
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.
Cubs Fan ★