The arrests followed an undercover investigation in which two county police officers lived at the shelter during the winter.

Why were your wife and daughter at the site of an undercover investigation?

An undercover investigation has resulted in 45 arrests, and more are expected.

She is known for her talented work in undercover investigations.

The company has been the subject of several undercover investigations since 1989.

One article discussed the dangers of police work and undercover investigations.

He was arrested at his home after an eight-month undercover investigation by the state police.

"I don't have anything against undercover investigations," one juror said.

I'm going to assign you to a special undercover investigation.

In fact, our undercover investigation has run up against a complete blank wall.