Investigated

We investigated the matter from all angles.

The papers found lots of monkey business when they investigated the Recruit scandal.

Charles Walcot investigated the magnetic compass bearing sense in pigeons.

John investigated the accident thoroughly.

The police carefully investigated the cause of the accident.

The cause of the accident was being investigated by the police.

A research organization investigated the effect.

He has investigated the possibility of cooperation.

They have investigated the possibility of cooperation.

She investigated the company's output record carefully.