nitpicking, The bleach-injecting cult leaders have been sentenced to prison: https://arstechnica.com/health/2023/10/florida-men-sentenced-to-years-in-prison-for-selling-bleach-as-miracle-cure/
I would have called it impossible. Health cultists almost never get criminal penalties. Homeopaths and acupuncturists are still free. I guess the difference is that they only occasionally (unintentionally) harm people, where injecting bleach is just too obviously and literally poisoning your patients.
Good news, though: these people are now convicted criminals.