An investigation has shown that not more than three are possible.

Only scientific investigation can show which is more likely to be correct.

But an extensive investigation has shown that the boys' story was true.

By noon the next day, the investigation had shown good progress.

Further investigation showed that the company had no telephone number, another red flag.

An army spokesman said an investigation had shown that soldiers in the area did not open fire.

The investigation showed no abnormalities in any of the control patients.

That was not true before the war - as multiple investigations have shown.

There, too, an investigation showed management had ignored the details.

Investigation shown that driver's health problems were most likely to cause the accident.