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An undercover investigation.
Undercover FBI agents.
Undercover work as a spy.
Doing undercover work like this, you can't be too careful.
Only his undercover agents contained such little information in his database.
She'd been deep undercover in much worse situations.
The first undercover investigation was in 1981 by Sarah Kite.
Gabrielle Union plays a Drug Enforcement Agency undercover operative who also happens to be Smith's love interest and Lawrence's cousin.