When conducting human subjects research, social and behavioral researchers seeking to study current issues involving immigrants, refugees, and undocumented students must submit their research to an institutional review board (IRB). Research applications proposing to enroll these populations lie outside the scope of vulnerable populations named in the U.S. Code for Federal Regulations (45 CFR 46). Through a consideration of privacy, confidentiality, flexibility in providing protections, and case study examples, this article examines how researchers and IRBs can negotiate protecting participants who may be undocumented while supporting the advancement of research in the midst of the current, and uncertain, political climate.