No formal charges have been filed against any party despite years of exhaustive investigations.

But despite an exhaustive investigation there has been no trace of her since.

Mitchell had narrowed the list of possible candidates through exhaustive investigation.

It claimed the settlements had only been established after exhaustive investigations making sure none were built on private land.

Government agencies were summoned for an even more exhaustive investigation.

Despite an exhaustive investigation, the police had never been able to obtain enough hard evidence to bring Twain before a grand jury.

It called on the government to hold a "special and exhaustive investigation".

"They've done a very exhaustive and intensive investigation," he said.

We expect that further decisions will be conditional on an exhaustive and independent investigation.

An exhaustive investigation forced the resignation of the country's prime minister in 2002.