Nearly half of all the contracts examined in a four-year investigation were determined to be overpriced.

The charges are the result of a four-year investigation.

The indictment was the result of a four-year investigation.

A four-year federal investigation into the relationship ended in January without prosecutors seeking criminal charges.

This is the result of almost a four-year investigation.

It was not clear if the ethics panel had referred any of the accusations in the four-year investigation to law enforcement agencies.

He was re-elected in 1995, despite a four-year investigation into his finances.

The settlement was the biggest in half a dozen cases resulting from a four-year investigation that involved most major clinical laboratories.

The four-year investigation has turned the well-established auction world upside down.