State Newborn Screening Program Policies on Residual Dried Blood Spot Retention and Release for 39 Queried States, United States, 2009–2010. Black = DBS retrieved, dotted = request pending, dark gray = DBS stored ≥5 years, gray = DBS stored 1-<5 years, light gray = DBS stored <1 year, hatched = refused, white = not queried. (United States map courtesy of Minnesota Population Center. National Historical Geographic Information System: Pre-release Version 0.1. Minneapolis, MN: University of Minnesota 2004 (http://www.nhgis.org). Shading via ArcGIS mapping software version 9.3, Esri, Relands, California.)