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Is there no US equivalent to the British HSE? The Health and Safety Executive is a government agency that has real teeth and isn't afraid to use them. In Britain I would report this idiot to them, and they wouldn't mess with any recreational dive certification agency (most of which they despise) but they would withdraw his license to operate. If there had already been offences committed they wouldn't hesitate to prosecute (they will do that for a first offence if it's serious enough) but they would "get the guy off the streets" first.
The US equivalent is OSHA, but it doesn't have a fraction of the power, resources and determination of HSE.
I have reported several bad instructors to their agencies, and I think I can truthfully say that nothing of consequence happened to any of them. That's recreational agencies, who are really in just for the money. Some of the tech bodies are concerned with standards more than money, and they WILL act.