Why Mr. Ban?

Asked why the scope of the chemical weapons investigation had been limited to whether the banned munitions had been deployed — and did not address the question of who had used them — Mr. Ban said that was his decision. “It was not to determine who has used against whom,” he said. The investigation was based on internationally recognized protocols, he said.

You'd think that WHO did what would be central to the issue. It's like saying someone was murdered and we're trying to find out how it happened but not who did it. By the way we're going to execute this guy over here for the crime.