This report provides an overview of the experience of nine States with biometric identification technologies as of September 1999 and discusses some of the major policy and operational issues encountered during implementation and testing. The report also synthesizes available information on the effectiveness of the technology in reducing duplicate participation and provides a discussion of measurement complexities and issues on the horizon as use of the technology continues to expand. A companion report contains an overview of biometric identification technology, examining the functional capabilities, performance, and applications of the various technologies with a particular focus on finger imaging, the most commonly used and well known.