I'm conducting a sort of personal investigation of my own.

Indeed, his first impulse had been to keep the information to himself until he conducted a quiet personal investigation.

The area was intensely radioactive and still precludes personal investigation.

He said the President did "some personal investigation of the computer system."

"I'm afraid you're going to tell me you haven't finished with your personal investigation," he said.

It would be personal investigation on the part of The Shadow himself.

I had understood that this was to be a personal investigation and report.

"There needs to be a lot of personal investigation," she said.

Instead, you start a little personal investigation without any authority to do so.

As for my personal investigation, I can't offer any anecdotal evidence on one side or the other.