It has been proposed that a trauma-informed organizational culture, that takes into account the role and impact of trauma in the patient’s lives, should be the basis for the implementation of trauma-specific services in health care settings (Brown, Harris, & Fallot, 2013). In current practice, however, this rarely seems to be realized. There is a wealth of evidence that health professionals often do not even ask about their clients’ experiences of CAN (Havig, 2008). The most important reason for this failure is an obvious lack of training for adequate inquiry and response to patients’ histories of abuse. For instance, in a large study among clinicians in community support centres, personal confidence and competence were positively related to the percentage of clients with whom trauma and PTSD had been discussed, documented, and addressed in treatment (Salyers, Evans, Bond, & Meyer, 2004). Other reasons seem to be a general underestimation of the prevalence of posttraumatic disorders in SUD patients and concerns to do harm when assessing trauma and PTSD (Gielen, Krumeich, Havermans, Smeets, & Jansen, 2014). Strategies to train practitioners regarding the consequences of trauma in their clients and regarding skills to assess CAN and other traumatic experiences therefor are a prerequisite for the dissemination of trauma-specific treatments in SUD settings.