Historical textIn force on Oct. 1, 1997Source: annual CFR edition 1996

§ 391.81 Purpose and scope.

Wording first on file in the 1996 annual edition, superseded by the 1998 annual edition. The section was then removed.

govinfo, 1996 edition ↗

Before Jan. 1, 2017 the record is one snapshot per annual CFR edition, revised as of October 1. This is the 1996 edition's wording. An amendment that took effect between Oct. 1, 1997 and Oct. 1, 1997 would not appear until the next edition, so check the citations below and the Federal Register for exact effective dates. govinfo does not publish the 1997 edition of Parts 300–399 in machine-readable form, so the 1996 text is shown for that year.

49 CFR § 391.81 — Purpose and scope.. Text in force on October 1, 1997. This wording effective October 1, 1996 to October 1, 1998. Source: govinfo, 1996 edition, https://www.govinfo.gov/app/details/CFR-1996-title49-vol4/CFR-1996-title49-vol4-sec391-81. Retrieved from FMCSR.com, https://fmcsr.com/reg/391.81?asof=1997-10-01, on October 26, 2026. Unofficial compilation; verify against the official source.

(a) The purpose of this subpart is to reduce highway accidents that result from driver use of controlled substances, thereby reducing fatalities, injuries, and property damage.

(b) This subpart prescribes minimum Federal safety standards to detect and deter the use of controlled substances as defined in 49 CFR part 40 (marijuana, cocaine, opiates, amphetamines and phencyclidine (PCP)).

(c) As part of reasonable cause drug testing programs established pursuant to this subpart, motor carriers may test for drugs in addition to those specified in this part only with approval granted by the Federal Highway Administrator under 49 CFR part 40 and for substances for which the Department of Health and Human Services has established an approved testing protocol and positive threshold.

Amendment history

1 distinct wording on file since Oct. 1, 1996

Oct. 1, 1996 → Oct. 1, 1998annual edition 1996viewing

A new entry appears whenever the regulatory words change between government snapshots. Day-precise from the eCFR (2017 onward); before that, one snapshot per annual CFR edition (revised as of October 1). Bracketed citations are the Federal Register history printed with the section.