The purpose of this pilot non-randomized, uncontrolled clinical trial is to test the feasibility and efficacy of written exposure therapy (WET) for posttraumatic stress disorder (PTSD) as adapted for use within the context of residential substance use disorder (SUD) treatment. All participants meet criteria for PTSD and are in a short term residential SUD treatment program (target residential treatment duration = 28 days) regardless of the research. The main question the study aims to answer is: 1) Is the delivery of adapted WET feasible and acceptable in short term residential SUD treatment for individuals with severe SUD?
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PTSD symptom reduction
Timeframe: Pre-WEST intervention; post-WEST intervention (approximately 14 days after randomization, but will vary based on when participants complete the intervention); 4-weeks post enrollment; 8-weeks post enrollment; 12-weeks post enrollment.