He presumably killed himself after being exposed as a fraud. It's weird to me because malpractice is such a heavy thing in the US, but I don't think it extends

He presumably killed himself after being exposed as a fraud. It's weird to me because malpractice is such a heavy thing in the US, but I don't think it extends into falsified research. Can a nation sue a researcher in another country because they funded studies based on their falsified data?