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• s  conducted with or marked by hidden aims or methods
  an undercover investigation

• Sunday's edition of Britain's Observer splashed an undercover investigative report across two pages, alleging children between 10 and 13 worked in conditions "close to slavery" in .
• An undercover agricultural investigator had infiltrated the co-op as part of a sting operation that resulted in the seizure of $7,000 worth of fresh-food items, including 35 lbs .
• Sixty of its 140 staff are undercover reporters in Burma.

• clandestine
• cloak-and-dagger
• hole-and-corner
• hugger-mugger
• hush-hush
• secret
• surreptitious
• underground

News & Articles

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• Undercover operation leads to pot arrest
  A suspected drug dealer, already on probation for one drug violation, is back in jail after an undercover operation.
  June 11, 2013 - WALB Albany
• 'Undercover Boss' CEOs Say What Really Changed After The Show
  It's not every day you'll see CEOs getting their hands dirty, working side by side the rank-and-file. But for four years, the CBS show " Undercover Boss " has given viewers that chance, showing 60 top executives doing regular jobs, from flipping hamburgers to installing alarm systems . The show, however, has attracted its fair share of skepticism: how many of those encounters are real?
  June 10, 2013 - Business Insider
• Undercover Sting Exposes Local Auto Theft, Crime Rings
  An undercover operation by local law enforcement has exposed auto theft rings across the North County and resulted in the arrest of dozens of suspects accused of trafficking not only stolen cars, but also guns... Photo Credit: Steven Luke
  June 6, 2013 - NBC San Diego