The company was already the subject of a 2003 investigation.
That needs to be the subject of a significant investigation.
The police say the matter remains the subject of an investigation.
Perhaps he should be the next subject of an official investigation.
As a result, he was the subject of a criminal investigation into the matter.
At present, the Director is the subject of a criminal investigation.
They are now the subject of a federal criminal investigation.
The land deal is now the subject of a court battle and a federal investigation.
This matter is the subject of a separate investigation at present.
These are now the subject of a federal investigation and a civil rights lawsuit.
