He had not learned that fact upon his previous investigation.

The previous investigations have lasted for more than five years until now (May 2013) and are still without any result.

The Committee will be raising this issue with police officers involved in the current and previous investigations.

That's why I have used you for previous investigations.

The study analyzed data from previous independent investigations on problem gambling over the last 20 years.

It was noted that the site had become even more ill-defined since the previous investigation.

One lawyer said that in all previous investigations numerous witnesses had been heard.

But previous investigations of the oil industry have proved fruitless.

Previous investigations had identified areas where the insurers' record keeping could be improved.

The University had attempted three previous investigations and was not successful at gathering enough evidence to proceed further until the federal government got involved.