Effectiveness, Implementation, and Cost of Cognitive Processing Therapy in Prisons

Inclusion Criteria: * 18 years of age or older * Able to understand and speak English * Able to give informed consent * All items listed in "Inclusion criteria for all participants" * Be currently incarcerated in one of the prisons that have partnered as study sites * Have met criteria for a drug use disorder in the year prior to their current incarceration (≥ 2 symptoms on a DSM-5 drug use disorder checklist) * Have used drugs in the 30 days prior to their current incarceration * Have a history of traumatic event exposure * Endorse clinically significant posttraumatic stress symptoms (score ≥ 4 on the Primary Care PTSD Screen for DSM-5; PC-PTSD-5) * Expect to be incarcerated for at least long enough to complete CPT-CJ as it is being implemented at the particular site (i.e., anticipated to be \~3 months, but will depend on dates associated with next available intervention group) * Expect to be released from prison within 12 months following the end of treatment (i.e., within \~15 months of the pre-treatment assessment) * Willing to consent to randomization to treatment condition Exclusion criteria for prisoners (additional requirements assessed during pre-treatment assessments or indicated by prison staff; will result in being withdrawn from the study prior to randomization by the PI): * Unable to provide any locator information for post-release assessments * Determined to be releasing sooner than would allow the individual to complete CPT-CJ * Determined to have an unavoidable scheduling conflict or facility restriction (e.g., disciplinary, medical) that would prevent participation in CPT-CJ. Of note, if the scheduling conflict or facility restriction is expected to resolve following the next round of randomization at the study site, the participant may be put on "hold for next round" status rather than withdrawn unless other exclusionary criteria would be met by that time (e.g., release).