DHS and other agencies are amassing more and more data that they subject to sophisticated analysis. A customs document issued last month stated that the agency does not perform data mining on border crossings to glean relationships and patterns that could signify a terrorist or law enforcement threat. But the Federal Register notice states that information may be shared with federal, state and local governments to test "new technology and systems designed to enhance border security or identify other violations of law." And the Homeland Security Act establishing the department calls for the development of data-mining tools to further the department's objectives.