The Federal Bureau of Prison’s Residential Drug Abuse Program is a rigorous and well-regarded substance abuse rehabilitation program available to incarcerated people in federal prisons across the United States. Noncitizen incarcerated people are wholly excluded from the program despite comprising 25% of the federal prison system. In this paper, I will argue that when the US government excludes noncitizens from rehabilitation and reentry programs, they lose valuable opportunities to decrease spending on incarceration, improve the lives of noncitizens, their citizen families, and their communities, and cultivate a healthier environment in the prison system. I will first discuss the myriad of circumstances that cause noncitizens to be incarcerated, highlighting the diversity of experiences and the importance of rehabilitation. I will then address counterarguments about the expense and effectiveness of rehabilitating soon-to-be-deported individuals. Finally, I will acknowledge and counter the court decisions that have justified the exclusion of noncitizens from prison programming as compatible with the constitutional concept of equal protection.