In medical treatment setting almost everything you do is recorded also. Certain procedures may need more direct supervision depending on experience of the intern, but even suggesting the patient be given aspirin will be recorded as well as patient information that led to that decision. Sure mistakes can still be made, but they are better documented in health care than in construction type trades as a general rule.Every time I see a medical show with interns following a doctor on rounds, there seems to be three or four of them. That said I don't think you can compare doctors and electricians. Electrical apprentice screw-ups may result in lost money. Intern screw-ups may result in loss of life. Apprentices are sent off to work by themselves routinely. I would hope that interns are more closely monitored.