Having prepared and taught a biosocial criminology course here at FIU this spring, I became aware of a vast array of studies linking biomarkers (e.g., heart rate, skin conductance) to antisocial and violent behavior. One of these biomarkerrs is the r2D:4D ratio, which is a measure of the relative length of a person's right pointer finger (2D) to their right ring finger (4D). This ratio provides an indirect indicator of the amount of testosterone someone was exposed to while in the womb. Recently, criminologists have started to take an interest in the association between the r2D:4D ratio and antisocial behavior, with studies finding that adults who have a smaller r2D:4D ratio are more likely to report involvement in violent behavior (Ellis and Hoskin, 2013; Hoskin and Ellis, 2014). Given the infancy of this line of inquiry, I have sought out Anthony Hoskin and proposed that he and I collect new data to investigate unexplored questions. He happily agreed and we will be collecting new data in the fall to examine, among other things, the following questions: To what extent does the r2D:4D ratio correlate with violent victimization? Are various measures of self-control correlated with the r2D:4D ratio? Does the r2D:4D ratio moderate the effect of holding street code values on violent offending? We anticipate obtaining data from at least 400 individuals using a combination of survey methods and by taking high resolution scans of the right hands of participants to get a very precise measure of the r2D:4D ratio. We will present our preliminary findings at the ASC conference in November in Washington, D.C.