In Washington State, the majority of juvenile offenders are handled by the juvenile criminal justice system. However, juveniles who commit serious violent crimes undergo a process known as declination, in which they are processed as adult defendants in adult courts. These juveniles are typically housed in jail with adult inmates, an experience which nation-wide studies have shown to be severely damaging to both their mental and physical well-being. Research regarding the prevalence of this practice in Washington State is slim. Our report aims to rectify this dearth of information by examining relevant statutes and case law, by interviewing various actors in the criminal justice system—including incarcerated youth themselves—and by sending information requests to all 39 counties in Washington State. The first section of our report will detail the types of declination in Washington and how to distinguish between the four main holding facilities: the Juvenile Detention Center, Juvenile Rehabilitation Administration, jail, and prison. Part two will present statistics regarding the number of declined juveniles held in each county jail since 2009, as well as county policies surrounding these declined individuals. Our preliminary research shows that hundreds of juveniles have been declined and held in jails since 2009. The third section will analyze the repercussions of incarceration on a juvenile’s life, as well as detail our personal interviews with several inmates from the Green Hill Juvenile Rehabilitation Administration. Our final section will analyze the differing opinions on the declination process, as well as present some of our own recommendations for improving the current system. We hope that these ideas will lead to the adoption of policies that will protect both public safety and the well-being of the inmates themselves, and provide these youth with the tools they need to successfully reintegrate into society.