In an article in the February 2014 issue of Demography, Guo et al. claimed that their research “establishes geographic genetic bio-ancestry as a component of racial classification” (p. 141). In doing so, they argued that their work has “a larger theoretical significance on identity studies” (p. 169) by providing racial classification categories with a concrete, “measurable,” and “logical” basis against which social construction should be analyzed. Instead, I argue that their main accomplishment is the “molecular reinscription of race” (Duster 2011:104). In this article, I review the existing critiques of this type of work.