Eventually, they went undercover to take on the dealers alone.

The police tell the girls what has happened and they go undercover to catch Roger.

Roger Cook's team went undercover to try to stop the illegal trade.

Members of some groups even go undercover to make drug purchases and citizen's arrests.

"We need someone to back up a Starfleet officer who's gone undercover."

He is best known as the management consultant who went undercover to study various working conditions in the early twentieth century.

He goes undercover to write a story about corrupt cops and the drug trade.

Mike fears that Jo has gone too far undercover, but she doesn't care.