Have you checked out the resources from TRAC on identifying and analyzing the practices and programs related to immigration enforcement in the US?
From the synopsis:
The new and well-documented view of the nation’s massive immigration enforcement program has been made possible as a result of a Transactional Records Access Clearinghouse (TRAC) analysis of millions of detailed records obtained from the Immigration Courts (EOIR) under the Freedom of Information Act. These administrative courts, part of the Justice Department, are a key part of the government’s program to deport or remove undocumented aliens as well as noncitizens who have been granted legal status to be in this country.
The massive study of the administrative actions in the immigration courts has been supplemented by a separate examination of other records collected by the Executive Office for U.S. Attorneys (EOUSA) that document criminal prosecutions in U.S. federal district courts.
To TRAC’s knowledge, such a broad inquiry of a core part of the nation’s immigration regulation program through these two lenses has never previously been undertaken.
Check out the overview and let us know if you found this resource useful!