Extensive laboratory and animal studies seem to rule out that possibility.

But officials said they were not ruling out that possibility.

I was saying, in effect, you can't rule out that possibility.

The wise parent will ask the doctor what checks he or she made to rule out that possibility.

Navy officials have all but ruled out that option again.

However, he did not completely rule out that possibility.

But surely last night must almost rule out that possibility.

Patrick said yesterday she would not rule out that move down the road.

So we should not rule out that aspect at all.

The Administration says it did not rule out that possibility.