The investigators described the physician as a cooperative and helpful witness.

One cooperative witness, at least, but one with information that had no real value to Clay.

"You benefit because customers will serve as cooperative witnesses," the book points out.

You don't want to alienate a cooperative witness, but we needed discretion.

Armitage has also reportedly been a cooperative and key witness in the investigation.

The authorities initially said that the girl was a cooperative witness.

Sometimes you ended up working very closely with a cooperative witness.

The police report added that he was not a cooperative witness.

The girl's lawyer defended her as a cooperative witness who was not a terrorist.

It had told him everything he asked of it; a most cooperative witness.