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U.S. DEPARTMENT OF HOMELAND SECURITY 
 
 
 
 
 
 
 
 
 

 
 
 
 
 
 
 
FISCAL YEAR 2011 
 
HOMELAND SECURITY GRANT PROGRAM 
 
SUPPLEMENTAL RESOURCE:  
LAW ENFORCEMENT INFORMATION SHARING (LEIS) SERVICE GUIDANCE 
 
 
 
 
 
 
 
 
 
  
 
 
 
LEIS GUIDANCE 
 
The Law Enforcement Information Sharing (LEIS) Service is a standards-based data exchange platform designed to aid investigations by allowing the Department of Homeland Security (DHS) and other law enforcement agencies to share pertinent, legally sharable case information rapidly and extensively. The LEIS Service offers investigators a more efficient, automated system for obtaining information and helps to quickly identify non-obvious relationships, patterns and connections between individuals and organizations. The LEIS Service promotes DHS compliance with information exchange technical standards, including the National Information Exchange Model (NIEM) standards for justice information, Department of Justice (DOJ) and DHS standards for law enforcement information (including the DOJ XML Standards Initiative), and the Federal Intelligence Community (IC) standards for intelligence information (e.g., national or Federal Information Sharing Environment (ISE) Enterprise Architecture Framework [EAF], the ISE’s Counter-Terrorism Information Sharing Standards [CTISS], and the NIEM and DOJ Law Enforcement Exchange Service [LEXS]).  
 
The benefit of the LEIS Service and its information sharing solution is that it expands and appropriately engages all necessary participants at all levels: Federal, State, local, tribal, international, and private sector. Law enforcement information is often the most critical information for solving cases, as well as, abating threats. The full fusion of law enforcement information contributes to strategic, tactical, and operational mission success and is critical within the investigative process. The solutions currently being driven by DHS are geared toward accommodating the needs and capabilities of the end user. Additionally, the DHS LEIS Service can be used with various regional information sharing systems to provide access to DHS law enforcement information.  
 
For more information, contact Steven W. Cooper, Executive Director, DHS Law Enforcement Information Sharing Initiative (LEISI) at 202-732-3708 or by e-mail at DHS-LEISI@dhs.gov.