He didn't press the matter, though he filed it away for future investigation.

This was something to be remembered for a future investigation.

There is clearly a rich field for future investigation into matters of such major importance.

The family is seeking to establish a foundation to finance this search and perhaps future investigations.

How that had happened was a matter for future investigation.

Whether that would come to light in any future investigation remains to be seen.

That will make my future investigations a little more difficult, but I can handle that.

This was done and became the standards upon which future biochemical investigations were based.

Evaluation of this possibility will be the subject of future investigation.

The mission was to recover human remains, personal property and evidence for future investigations.