Justice Core Trial

The goal of this clinical trial is to learn if Justice Core, an intervention that moves pregnant women with substance use disorder (SUD) from jail into community-based SUD treatment while awaiting trial, can improve the health of pregnant women compared to referring them to treatment at the time of jail release. The main questions it aims to answer are: * Will the Justice Core intervention help women start and stay in SUD treatment compared to a group of women being given a treatment referral when they leave the jail? * How does the Justice Core intervention affect pregnancy health outcomes compared with a group that is given a treatment referral when they leave the jail? * What are the challenges in starting a new intervention, keeping it running, and the ethical issues during and after the trial? Researchers will compare the outcomes of women who receive the Justice Core intervention with women who receive a treatment referral when they are released from jail. They will look at how many women start and continue treatment and compare pregnancy-related and incarceration outcomes. Participants will be asked to: * Complete a treatment assessment. * Take part in three follow-up phone surveys. * Some participants may also be asked to complete a longer phone interview to share more about their experiences.