Hospitals and health clinics are increasingly turning to "undercover patients" to evaluate the performance of doctors and their staffs, and to grade the healthcare experience being offered. As a result, the ethics council of the American Medical Association is pressing the doctors group to endorse such practices. AMA delegates are expected to vote on the proposal during their five-day meeting beginning June 14. Some doctors are outraged at the idea, however, saying that the practice is deceitful and could have disastrous consequences.