The Emergency Medical Treatment and Labor Act passed in 1986 in direct response to a national pattern of "patient dumping" — uninsured emergency patients turned away at the door, or shipped off to other hospitals before they were stabilized. The most notorious case involved a woman in active labor in Chicago who was refused care at one hospital and delivered her baby in the back of a transferring ambulance. The baby didn't survive.
EMTALA requires every Medicare-participating hospital with an emergency department to provide a medical screening examination for anyone who walks in — regardless of ability to pay, insurance, immigration status, or anything else. If they have an emergency medical condition, the hospital must stabilize them before discharge or transfer. Penalties scale up to $133,420 per violation for hospitals with 100+ beds (inflation-adjusted from the original $50,000), and physicians can be personally fined and excluded from Medicare. EMTALA also has a private right of action — patients can sue.