Data documentation from ICE

We collect any government documents and information that shed light on the tables, fields, and values in government data systems. These include:

1. Internal documentation: The agency’s own documentation of its data systems, including data dictionaries and codebooks.
2. Training materials: Training materials for agency staff on using data systems.
3. Privacy Impact Assessments (PIAs): Documents which outline the fields collected in government data systems and how they interrelate, as required by the E-Government Act of 2002.
4. System of Records Notices (SORNs): Similar but often distinct content to PIAs, required for public disclosure under the Privacy Act of 1974.
5. Court documents: Documents including sworn declarations from agency staff from litigation.

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See agency documentation for documents from all agencies.

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Some documents were obtained via a FOIA request by the ACLU of Southern California, the National Immigration Project, and Mission Action. Several of the data dictionaries were obtained via FOIA litigation by the American Immigration Council (AIC v. DHS, 1:21-cv-01642).