Researchers have compiled a list of collaborations between local police and immigration agents. This list is based on numerous public records requests. The investigation was conducted by Koby Levin and Adam Rayes, in association with Outlier Media and Michigan Public.

Details of the collaborations are available through the researchers' work. The list was formed using decenas of solicitudes de registros públicos, or tens of public records requests.

Further information on the investigation and its findings can be found through the original source, which provides a detailed account of how the research was conducted.