This report, from SHARE grantee Stan Dorn of the Urban Institute, details findings from an analysis of Louisiana's landmark used of automated Medicaid enrollment via Express Lane Eligibility (ELE), a strategy authorized by the Children's Health Insurance Program Reauthorization Act of 2009 (CHIPRA).  Under this initiative Louisiana automatically enrolled children into Medicaid based on data matches indicating eligibility for the federal Supplemental Nutrition Assistance Program (SNAP).  Dorn and his co-authors analyze the impact of Louisiana's ELE implementation on several outcomes including enrollment, coverage, administrative costs, and administrative efficiency, offering a number of lessons for other states considering the use of ELE for public program eligiblity determination.