49 CFR Part 40
49 CFR Part 40 is an umbrella regulation that governs the overall
rules and responsibilities for all employers and all service agents.
This document is the core of the regulation. No employer or service
agent should be without a complete and up-to-date copy of Part 40.
CFR Part 40, Procedures for Transportation Workplace Drug and Alcohol
This version is up-to-date as of May 4, 2012. This is a PDF
document, 100 pages long.
The first 77 pages are the regulations. From page 78 to page 100
you will find Appendices and other supporting information relevant
to the regulation.