The assurance of confidentiality of Census Bureau data is provided by Title 13 of the United States Code (U.S.C.). As such, NLMS operational procedures carefully follow well-defined practices designed to maintain the confidentiality of personal records as required by Title 13. These practices include the prevention of disclosure through the elimination of sparse cells in publications, the prohibited release of small-area geographical information on the NLMS public-use file, the use of an individually assigned NLMS control number to identify records instead of the use of personal identifiers for these purposes, and the restriction of persons having direct access to the NLMS database. A violation of Title 13 includes assessment of severe penalties including a prison term of up to 5 years and/or fines of up to $250,000, for any individual found guilty of releasing confidential information. In addition, any data acquired for NLMS purposes from an external agency is acquired under strict confidentiality protections and agreements that govern its use and subsequent release.