---
kind: "unit"
title: "49"
title_heading: "Transportation"
key: "subtA/part40/subpartO"
level: "subpart"
label: "Subpart O"
heading: "Substance Abuse Professionals and the Return-to-Duty Process"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/49/subtA-part40-subpartO"
sections_count: 16
---

# Subpart O — Substance Abuse Professionals and the Return-to-Duty Process

Title 49 C.F.R. — Transportation › Subtitle A — Office of the Secretary of Transportation › Part 40 — Procedures for Transportation Workplace Drug and Alcohol Testing Programs

## Sections

- [§40.281. Who is qualified to act as a SAP?](/cfr/49/40.281.md)
- [§40.283. How does a certification organization obtain recognition for its members as SAPs?](/cfr/49/40.283.md)
- [§40.285. When is a SAP evaluation required?](/cfr/49/40.285.md)
- [§40.287. What information is an employer required to provide concerning SAP services to an employee who has a DOT drug and alcohol regulation violation?](/cfr/49/40.287.md)
- [§40.289. Are employers required to provide SAP and treatment services to employees?](/cfr/49/40.289.md)
- [§40.291. What is the role of the SAP in the evaluation, referral, and treatment process of an employee who has violated DOT agency drug and alcohol testing regulations?](/cfr/49/40.291.md)
- [§40.293. What is the SAP's function in conducting the initial evaluation of an employee?](/cfr/49/40.293.md)
- [§40.295. May employees or employers seek a second SAP evaluation if they disagree with the first SAP's recommendations?](/cfr/49/40.295.md)
- [§40.297. Does anyone have the authority to change a SAP's initial evaluation?](/cfr/49/40.297.md)
- [§40.299. What is the SAP's role and what are the limits on a SAP's discretion in referring employees for education and treatment?](/cfr/49/40.299.md)
- [§40.301. What is the SAP's function in the follow-up evaluation of an employee?](/cfr/49/40.301.md)
- [§40.303. What happens if the SAP believes the employee needs additional treatment, aftercare, or support group services even after the employee returns to safety-sensitive duties?](/cfr/49/40.303.md)
- [§40.305. How does the return-to-duty process conclude?](/cfr/49/40.305.md)
- [§40.307. What is the SAP's function in prescribing the employee's follow-up tests?](/cfr/49/40.307.md)
- [§40.309. What are the employer's responsibilities with respect to the SAP's directions for follow-up tests?](/cfr/49/40.309.md)
- [§40.311. What are the requirements concerning SAP reports?](/cfr/49/40.311.md)