NEW YORK (AP) — A nurse who treated Ebola patients in Sierra Leone is the first test case of quarantine policies now in effect in three states over heightened fears the deadly virus could be spread by health care workers returning to the United States. The sketchy details of how such quarantines will be handled are drawing sharp criticism from humanitarian organization Doctors Without Borders, and infectious disease experts said Saturday that many of the logistics about enforcement are likely still up in the air. Kaci Hickox, a Doctors Without Borders nurse, remained isolated at a hospital Saturday, a day after she returned to the U.S.