Statistics are clear that DBT considerably falls short in treating the client that presents with co-occurring SUD and BPD. As psychotherapists seek to ever evolve their intervention techniques in the best interest of client care, this research sought to identify DBT's current effectiveness when it is applied to individuals who have a co-occurring mental health and substance use disorder from the perspective of DBT practitioners, and to offer suggestions in order to increase treatment success for the SUD-BPD patient.