"In the first edition of this guide, we aimed to reach out to correctional agencies in order to help them identify, address, and respond to abuse of LGBTI individuals through agency policies and procedures. We hoped to deepen the dialogue between staff and administrators as well as community leaders and criminal justice advocates about strategies to eliminate abuse of LGBTI individuals in custody. The second edition of this guide provides updated key information to correctional agencies about PREA’s impact on agency practice as it relates to LGBTI individuals in custody" (p. 1). This guide is made up of three chapters: introduction and overview-introduction, evolving terminology and definitions, core principles for understanding LGBTI individuals in custody, and emerging data on LGBTI individuals in custodial settings and the challenges they face; LGBTI youth under custodial supervision-the law, PREA standards, other governing principles (state human rights laws and professional codes of ethics), and elements of legally sound and effective policy and practice; and LGBTI adults under custodial supervision-the law, PREA standards, and elements of legally sound and effective policy and practice. Appendixes provide: glossary; case law digest; additional resources; webpages with sample policies; Issues to Watch: The Impact of Non-Custodial LGBTI Developments on Corrections; sample policies; and training matrices.