This chapter describes how forensic social workers can develop their expert witness testimony skills. It explains how to advocate on behalf of vulnerable racial and ethnic populations generally underrepresented in American legal system, to increase advocacy from a human rights perspective. The chapter explores how to use expert testimony to highlight a range of social justice issues including human trafficking, death, and persecution. It introduces forensic social workers to integrating narrative methods with evidence-based trends that can best support any legal claim for hardship. Expert witness testimony comprises core mitigation components: client interviews; collateral interviewing; obtaining institutional records; identifying core themes of hardship that have directly impacted the individual or family; identifying intergenerational patterns of illness and/or systemic traumas that impact family; identifying environmental and country conditions; writing a report; and preparing for direct testimony and cross-examination.