IntroductionThe U.S. jail population has more than tripled since the 1980s, and today, one out of every three incarcerated individuals is being held in a county or city jail. Substance use disorders (SUD) are overrepresented in incarcerated populations; however, little recent research has examined the availability and quality of SUD-related health care services in jail settings. Incarcerated individuals may engage with a variety of SUD-related health care services, including: screening and withdrawal management at entry, SUD treatment or other brief health care interventions while they are being held, and overdose prevention education and reentry planning at release. MethodsWe conducted a thematic analysis of qualitative data from 34 interviews conducted with 38 personnel from a purposive sample of jails that varied in size and rurality within a five-state study area. The goals of the analyses were to: 1) describe jail health care services for SUD and barriers to service provision, 2) compare current practices to best practice recommendations, and 3) provide context by describing factors at the jail and community level that influence service provision, such as access to resources. ResultsInterviewees described wide variability in both availability and comprehensiveness of SUD-related health care services. Most adhered to federal guidance for supervising withdrawal from alcohol and benzodiazepines, but not opioids. Medication for addiction treatment was most widely available for pregnant women and rarely for other individuals. Roughly one third of the jails in our sample provided behavioral group or individual therapy with a licensed counselor and roughly one quarter offered self-help groups. Very few jails provided comprehensive re-entry planning and support. Jail staff reported specific barriers to providing each type of service, as well as limiting contextual factors. Despite observed increases in case volume, jail health care staff did not necessarily receive any additional funding or staff members. Overall, lack of investment in mental and behavioral health care contributed to recidivism and feelings of hopelessness among staff. ConclusionsThis study identified several areas where jails could improve SUD-related health care services. Many of the barriers to improvement—organizational buy-in, cost/budgeting, staffing, logistics—were not under the control of health care staff. Implementing changes will require support from local governments, jails administrators, private health care companies, and other local health care providers.