Peter Mancina has conducted ethnographic field research and archival research on the creation and implementation of San Francisco's sanctuary policies. This has included interviews with sanctuary movement leaders, organizers, activists, and public officials; and "participant observation" with sanctuary movement organizations and sanctuary city policy advocacy groups. Part of this work has included conducting research in San Francisco City Hall and working as a constituent services staff member for sanctuary city law author District Supervisor David Campos. In this capacity, his participant observation work has included assisting undocumented city residents in seeking city services in a manner which itself was governed by sanctuary city laws. His sanctuary city-focused research has also included assisting a coalition of immigrant-serving non-profits and legal organizations called the San Francisco Immigrant Rights Defense Committee, now renamed FREE SF in drafting and advocating for sanctuary city laws.