Factual error: While Drazen is a very common Serbian given name, it is not found as a surname in that form. The surname "Drazenovic" would be fairly common, but not simply "Drazen". Even then, it would be pronounced "Drah-zhen" and not "Dray-zen" as everybody in the show does.
Factual error: At some point Jack tries to get a message to CTU about the fact that he is being held hostage. The enemy sees Jack writing and tells Jack to shred the message. I work in government security. Believe me, no government agency would have a simple shredder that just cuts the paper into strips. Required is a cross cut shredder that breaks the paper into almost a pulverized state.
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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