We all hoped that all of our hard work and painstaking investigation would pay off.

"This remains a painstaking investigation with a substantial amount of information being analyzed and investigated."

Patient and painstaking empirical investigation would reveal the optimum measure of reform.

Finding him means police work - careful, painstaking, thorough investigation.

The painstaking investigation had borne enough fruit to encourage them to look for more.

There should have been a painstaking investigation, even after the fact.

Saltykova was held for six years (until 1768), while the authorities conducted a painstaking investigation.

The Church was being dangerously corrupted from within, and only the most painstaking investigation could protect it.

Later, the Americans wished a more painstaking investigation had been made.

We did not deceive ourselves as to what might happen if they really made a painstaking investigation.