ineffectual therapies which he denied including injecting a patient with hydrogen peroxide. the fda, also, sent him a warning letter over products he made and sold that promised to do everything from treating chronic pain to improving sex drive. >> and yet, i have unrestricted license to practice for 30 years. >> reporter: and that is the problem. dr. batar repeatedly lies and disinforms on matters of public health. yet, that doesn't have an impact on his medical license held in north carolina. across the country, covid-19 has created a subculture of disinformation among medical outcasts. state medical boards don't know what to do. >> those kinds of comments are very troubling to doctors who are on the front lines and managing covid. they are particularly frustrating. in fact, some of hmy colleagues are livid. >> cnn contacted medical boards in all 50 states. half of them responded.