The Electronic Frontier Foundation has raised alarms over a Palantir-built targeting tool that it says Immigration and Customs Enforcement is using to locate people for possible arrest with address information drawn from federal government sources, including systems connected to Medicaid.

The advocacy group identified the system as Enhanced Leads Identification & Targeting for Enforcement, or ELITE. Citing a report by 404 Media, EFF said the tool places potential targets on a map, displays a dossier for each person and assigns a confidence score to a current address. Agents can also use the map to identify locations where several people sought by ICE may be found, according to EFF’s account.

EFF said the underlying report was based in part on testimony by law-enforcement agents in an Oregon court proceeding. The organization described the Department of Health and Human Services, which encompasses the federal Medicaid program, as one source of addresses supplied to ELITE. Other government sources also contribute data, although the excerpt supplied for this report does not specify them or explain the system’s matching methods.

The disclosure puts a concrete workflow behind a broader privacy dispute: information collected so agencies can administer health benefits or other services may later be pooled and used for immigration enforcement. EFF argues that this repurposing gives the government unusually broad power and departs from the reason individuals originally provided the information.

The group had previously asked a federal judge to prevent the government from using Medicaid data to identify and deport immigrants. It has also challenged access to taxpayer records and personal data held by the Office of Personnel Management, and sought to stop monitoring of protected speech by noncitizens lawfully in the United States. Those actions form part of EFF’s campaign against consolidation of government databases into searchable systems.

Important questions remain unresolved in the supplied evidence. It does not state how many people have been identified through ELITE, how often its confidence scores are wrong, what human review occurs before an arrest, or what safeguards govern access and retention. It also does not include responses from ICE, Palantir or HHS. The account therefore establishes EFF’s claims and concerns, not an independently tested assessment of the tool’s accuracy.

EFF is calling for public scrutiny and congressional limits in addition to litigation. Its warning centers on function creep: once records from separate public programs become interoperable, capabilities built for administration can be redirected toward surveillance and enforcement without the affected people expecting that use. The debate consequently concerns both the accuracy of an individual lead and the legitimacy of moving sensitive records across programs for a new purpose.