Suspect Families is the first book to investigate the social, political, and ethical implications of parental testing for family reunification in immigration cases. Drawing on policy documents, legal frameworks, case study material and interviews with representatives of governmental and non-governmental organisation and immigration authorities, immigration lawyers, geneticists and applicants for family reunification, the book analyses the different political regimes and social arrangements in which DNA analysis is adopted for decision-making on family reunification in three distinct European countries: Austria, Finland and Germany. Interdisciplinary in scope, the book reconstructs the processes, institutional logic and the political and administrative practices of DNA testing from a comparative perspective, combining theoretical conceptualisation with detailed empirical work to explore the central societal, political and ethical issues raised by the use of DNA profiling in the context of immigration policy. A ground-breaking study of the role played by new technologies in migration decisions, Suspect Families will appeal to scholars of sociology, political science, science and technology studies and surveillance studies.