This sub has discussed Dr Weiner previously, after excellent reporting by ProPublica and the Montana Free Press. The tl;dr is that he was the only oncologist at his hospital, offered treatments to at least a few patients who didn't have cancer including opiates, at least one person died of chemotherapy toxicity for unproven cancer, and the hospital looked the other way for revenue reasons.
The Montana medical licensing board has revoked his ability to practice in Montana, which seems like a great step. I hope the victims and families of his malpractice find peace.
Previous discussions:
https://www.reddit.com/r/medicine/comments/1h8sf6i/eat_what_you_kill_when_rvubased_compensation_goes/
https://www.reddit.com/r/medicine/comments/1hlp2jp/follow_up_article_on_the_montana_oncologist/