CFR›Title 49›Subtitle B›Chapter VI›Part 655›Subpart A ContainsSections 655.1–655.7CorpusDaily eCFRDisplayed edition2026-04-23Last updated2026-04-23 Subpart A—General Sections 655.1 § 655.1 Purpose. 655.2 § 655.2 Overview. 655.3 § 655.3 Applicability. 655.4 § 655.4 Definitions. 655.5 § 655.5 Stand-down waivers for drug testing. 655.6 § 655.6 Preemption of state and local laws. 655.7 § 655.7 Starting date for testing programs. Next B Subpart B—Program Requirements