The recent death of civil rights leader Coretta Scott King at a Mexican cancer clinic put the spotlight on the industry of alternative treatment clinics in Mexico. King, the widow of the Rev. Martin Luther King, Jr., sought a last-ditch cure for her terminal cancer at one such clinic. Critics charge the clinics are exploiting the desperate with unsafe and non-FDA approved treatments, but advocates say they give hope and sometimes heal. Amy Isackson of member station KPBS reports.