Is contemporary interior immigration enforcement generating a “chilling effect” on Medicaiduse among Latinos? In the first section we theorize the “chilling effect” as a subclass of “massfeedback effects,” which we expand to include a narrative of contemporary Latino politics. In the second section we introduce the details of Secure Communities and explain how itfits in the broader development of America’s new immigration enforcement regime. The section after that describes our data, measures and methods. In addition to complimenting existing findings on the “chilling effect” of immigration enforcement, we present analyses that show patterns of heterogenous “chilling effects,” both in terms of nativity and immigrantgeneration, and across race/ethnicity and immigration status. The final section summarizes and concludes with thoughts about future research directions.