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Carrier Regulations

Drug & Alcohol Testing Requirements

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Arnold & Itkin Research Team

Reviewed by Kyle Findley

Federal Drug & Alcohol Rules

Commercial drivers operate vehicles that can weigh 80,000 pounds at highway speeds. The consequences of driving under the influence are not comparable to those of an impaired passenger vehicle driver. Congress recognized this when it passed the Omnibus Transportation Employee Testing Act in 1991. The act requires all Department of Transportation (DOT) agencies to implement drug and alcohol testing for safety-sensitive transportation employees. Since the early 1990s, the Federal Motor Carrier Safety Administration (FMCSA) has defined drug and alcohol testing rules and regulations for employees who drive commercial trucks and buses requiring a commercial driver’s license. These regulations identify who is subject to testing, when they are tested, and in what situations.1

In line with its statutory mandate, the FMCSA promulgated rules, codified 49 C.F.R. § 382. These rules set minimum standards that every regulated carrier must adhere to at various phases of a driver’s employment: before they are hired, while they are working, after an accident, and when there is visible reason to suspect impairment. Each drug and alcohol testing obligation imposes a duty on a carrier. When a carrier fails to test, fails to act on a test result, or allows a driver with a recorded violation to stay behind the wheel, the carrier fails to comply with federal regulations and breaches its compliance duty.

Six Testing Situations Under 49 C.F.R. Part 382

Federal rules require drug testing, and in some cases alcohol testing, at six specific points in the driver’s course of employment spelled out in 49 C.F.R. § 382 Subpart C.

Each testing point has distinct regulatory requirements and time frames that carriers are legally obligated to adhere to:

  • Pre-employment. Employers must receive the results of a negative pre-employment drug test before allowing a driver to operate a commercial motor vehicle. There is no pre-employment alcohol test requirement under the federal rules, though carriers may conduct one voluntarily. A carrier that puts a driver in a truck before receiving a negative drug test result violates federal regulations.2
  • Random. As of January 1, 2020, the FMCSA random testing rates require that 10 percent of the average number of drivers in a program be tested for alcohol and 50 percent be tested for drugs each year. Drivers must be placed in a pool and selected without prior notice. The randomness is meaningful. Carriers that manage their pool selectively, or that tip drivers off before a test, are defeating the regulation’s safety function.3
  • Reasonable suspicion. Drivers who appear to be under the influence of drugs or alcohol can be immediately tested. Employers must train CDL driver supervisors to detect the symptoms of driver impairment. Reasonable suspicion testing must be based on specific, contemporaneous, and articulable observations, and must concern the driver’s appearance, behavior, speech, or body odors. The decision can only be made by a trained supervisor or a company official. In fact, 49 C.F.R. § 382.603 sets forth specific training requirements for supervisors designated to supervise drivers. A supervisor who observes signs of impairment and does not order a test or even lacks the required training to make the call creates a direct compliance failure the carrier owns.4
  • Post-accident. Accidents involving a fatality require testing. Testing is also required in accidents where one or more motor vehicles are towed from the scene or someone receives medical treatment away from the scene, if a citation is issued to the CMV driver.5 If a post-accident alcohol test is not administered within two hours following the accident, the employer must prepare and maintain a record explaining why. Then, after eight hours, the employer must cease alcohol testing attempts entirely and prepare and maintain the same records. For drug testing, the window extends to 32 hours, after which the employer must document why testing was not completed. Missing the window is itself a violation requiring documentation, which means a carrier that failed to test should leave a paper trail of its own non-compliance.6
  • Return-to-duty. Return-to-duty testing is required for drivers who tested positive, refused, or otherwise violated the prohibitions of 49 C.F.R. Part 382 Subpart B, and who have completed the return-to-duty process with a DOT-qualified substance abuse professional. This test is directly observed, and a negative result is required before resuming driving duties.7
  • Follow-up. After completing a return-to-duty test, a driver is not simply cleared to drive without further oversight. Follow-up testing continues under a schedule set by the substance abuse professional. At minimum, the driver will be subjected to six unannounced tests in the first twelve months of returning to safety-sensitive duties.8

Post-Accident Testing

When a commercial truck crash results in a fatality, involves a towed vehicle, or involves a citation and off-scene medical treatment, post-accident drug and alcohol testing is not discretionary. The time windows are strict, the documentation requirements are automatic, and the failure to comply is itself a regulatory violation.

The narrow window for alcohol testing described above exists because alcohol metabolizes quickly and delayed testing produces unreliable results. FMCSA auditors focus heavily on post-accident test records because these situations carry extremely high liability. A single missed test can result in enforcement action and jeopardize a carrier’s safety rating.9

In addition to impacting a carrier’s safety rating, missed post-accident testing also creates an evidentiary problem that cuts in a specific direction. A carrier that failed to test a driver after a qualifying crash cannot produce a negative result to establish the driver was sober. When impairment is a possible factor and the carrier failed to meet its testing obligations, the question of what the test would have shown remains unanswered because the carrier did not do what the regulation required.

Conversely, when post-accident testing is conducted, the results are among the most direct evidence available. A positive drug test result following a fatal crash is reported to the Clearinghouse, retained in the driver qualification file, and accessible to investigators. The result is timestamped, chain-of-custody documented, and verified through the medical review officer process under 49 C.F.R. Part 40, which outlines mandatory procedures for workplace drug and alcohol testing across transportation industries, before being reported.

Carrier Liability

The drug and alcohol testing records a carrier is required to maintain are, in effect, a continuous audit trail of what the carrier knew about its drivers’ fitness to operate. Pre-employment query records, annual query records, random testing documentation, reasonable suspicion records, and post-accident testing documentation all live in the carrier’s files for at least three years under 49 C.F.R. Part 382.

Federal regulations require employers to report drug and alcohol violations to the Clearinghouse by the close of the third business day.10 This immediacy requirement means that when a carrier has a driver with a violation, the federal database is updated almost in real time. Any carrier that employs that driver after the Clearinghouse window is a carrier that has access to that information and chooses not to look.

The Clearinghouse will show whether a pre-employment query was run, or if the annual query dates show a gap of more than twelve months.11 In such situations, the carrier has no defense of ignorance. It was required to look, yet it did not. Whatever the driver’s Clearinghouse record contained at that point was information the carrier should have had.

Failing to comply with the FMCSA Drug and Alcohol Clearinghouse regulations can result in fines of thousands of dollars per violation. If an employer fails to report violations or continues to allow a driver with violations to drive without going through the Substance Abuse Professional (SAP) process, the employer faces negligent hiring liability if the driver causes an accident and injures someone.12

Reasonable suspicion testing failures carry their own documentary trail. Under 49 C.F.R. § 382.603, supervisors who make reasonable suspicion determinations must be trained to do so. If a carrier cannot produce documentation that its supervisors received the required training, the carrier’s ability to identify and respond to impairment signs was structurally compromised, a program-level failure.

Sources

Frequently Asked Questions

  • Return-to-duty testing is required for drivers who tested positive, refused, or otherwise violated the prohibitions of 49 C.F.R. Part 382 Subpart B, and who have completed the return-to-duty process with a DOT-qualified substance abuse professional. This test is directly observed, and a negative result is required before resuming driving duties. After completing a return-to-duty test, the driver is not simply cleared to drive without further oversight. Follow-up testing continues under a schedule set by the substance abuse professional, with a minimum of six unannounced tests in the first twelve months of returning to safety-sensitive duties.

  • Pre-employment query records, annual query records, random testing documentation, reasonable suspicion records, and post-accident testing documentation all live in the carrier’s files for at least three years under 49 C.F.R. Part 382. The drug and alcohol testing records a carrier is required to maintain are, in effect, a continuous audit trail of what the carrier knew about its drivers’ fitness to operate.

  • Missing the window is itself a violation requiring documentation, which means a carrier that failed to test should leave a paper trail of its own non-compliance. A carrier that failed to test a driver after a qualifying crash cannot produce a negative result to establish the driver was sober. When impairment is a possible factor and the carrier failed to meet its testing obligations, the question of what the test would have shown remains unanswered because the carrier did not do what the regulation required.

  • If a post-accident alcohol test is not administered within two hours following the accident, the employer must prepare and maintain a record explaining why. Then, after eight hours, the employer must cease alcohol testing attempts entirely and prepare and maintain the same records. For drug testing, the window extends to 32 hours, after which the employer must document why testing was not completed.
  • Federal rules require drug testing, and in some cases alcohol testing, at six specific points in the driver’s course of employment spelled out in 49 C.F.R. § 382 Subpart C: pre-employment, random, reasonable suspicion, post-accident, return-to-duty, and follow-up. Each testing point has distinct regulatory requirements and time frames that carriers are legally obligated to adhere to.
  • Congress passed the Omnibus Transportation Employee Testing Act in 1991. The act requires all Department of Transportation (DOT) agencies to implement drug and alcohol testing for safety-sensitive transportation employees. Since the early 1990s, the Federal Motor Carrier Safety Administration (FMCSA) has defined drug and alcohol testing rules and regulations for employees who drive commercial trucks and buses requiring a commercial driver’s license. These regulations identify who is subject to testing, when they are tested, and in what situations.