Purpose People with developmental disorders are significantly more likely to experience adverse childhood experiences (ACEs), although the impact of ACEs on this population is not well understood. Furthermore, considerably less is known about the exposure to, and impact of, ACEs in detained adolescents with complex developmental disorder needs. This paper aims to explore the exposure to ACEs in an adolescent population detained in a secure specialist developmental disorder service. Design/methodology/approach A retrospective file review was used to explore ACEs and placement histories within a specialist developmental disorder inpatient service. Data was collated for a convenience sample of 36 adolescents, 9 of whom were female, aged 13–20 years (M = 17.28 years). Findings A total of 33 participants (91.7%) had experienced at least 1 ACE, with 58% experiencing 4 or more ACEs and 36% experiencing 6 or more ACEs. The most common ACEs reported were physical abuse (61.6%), parental separation (58.3%) and emotional abuse (55.6%). The majority of participants had also experienced high levels of disruption prior to admission, with an average of four placement breakdowns (range 1–13, standard deviation = 3.1). ACEs held a significant positive association with the total number of placement breakdowns and total number of mental health diagnoses. Practical implications Adolescents detained in specialist developmental disorder secure care had, at the point of admission, experienced high levels of adversities and had been exposed to high levels of experienced and observed abuse. The level of exposure to adversity and ongoing disruptions in care suggests that Child and Adolescent Mental Health Services’ developmental secure services should consider adopting dual treatment frameworks of developmental disorder and trauma-informed care. Originality/value This study explored the early-life and placement experiences of a marginalised and understudied population.

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