anchor: If they had had to wait until patients were sober, many would be discharged because in his ED, patients are discharged when staff estimate their BAC is below 0.08 g/dl.
positive: ED staff discharge patients when they estimate their BAC falls below 0.08 g/dl.
negative: The staff in the ED are required to keep patients until their BAC is 0.02 g/dl before they are released.