There are hints though, that Dr. Hibbert is not above dubious medical practices. After Marge talks him out of buying an unsuitable house, he suggests repaying her with black-market prescriptions. When he realized that Marge Simpson was initially unenthusiastic about having a third child, he implied that a healthy baby could bring in as much as $60,000 on the black market. Hibbert covered for himself against Marge's horrified reaction by saying that if she had replied any other way, she would be sent to prison, claiming that it was "just a test". It was also suggested in the episode "Wild Barts Can't Be Broken" that he does not in fact have a medical license.