This study used secondary data analysis to both identify and evaluate children with complex trauma who have interacted with the child protective services system. The study addressed a current gap in the literature by conducting secondary data analysis with this specific population. By using the NSCAW I dataset, two groups of children, one defined as complex-trauma likely and the other as not likely as complex trauma, were established. There was a significant difference between the average CBCL scores of externalizing behavior between the two groups. Additionally, for the complex trauma-likely specific population, disruptions in foster care placement had a statistically significant effect on externalizing behavior. Finally, a better understanding of the interaction of the variables of complex trauma, number of placements, and behavior was explored by using linear regression analysis.