This paper investigates 10 socio-demographic and case characteristic variables as predictors of use of evidence-based practice and non-evidence-based practice in the treatment of psychological trauma. A national random sample of 2,400 trauma treatment specialists in all 50 states and the District of Columbia were sent surveys with a response rate of 29.6% (N = 711) usable surveys returned. Stepwise regressions conducted on evidence-based practice use indicated that special trauma training, older age, and higher percentage of PTSD on the case load were the only significant predictors of evidence-based practice use. Implications for trauma practices are indicated.