Employer's Responsibilities Under the Drug & Alcohol Clearinghouse

Closing the Previous Employer Loophole

Before January 6, 2020, the federal drug and alcohol testing system had a structural weakness that carriers and drivers both understood: a driver who tested positive at one carrier could apply to a new carrier, and when the new carrier reached out to the previous employer, the previous employer did not answer (which frequently occurred in the trucking industry). The positive test history was effectively invisible to the new employer. Drivers could, and did, move across the industry with unresolved violations.

The answer to this loophole is the Clearinghouse. The Clearinghouse is a secure online database that gives employers, the Federal Motor Carrier Safety Administration (FMCSA), state driver licensing agencies, and state law enforcement personnel real-time information about Commercial Driver's License (CDL) and Commercial Learner's Permit (CLP) holders' drug and alcohol program violations. The Clearinghouse contains records of violations of drug and alcohol prohibitions under 49 C.F.R. Part 382, including positive drug or alcohol test results and test refusals.¹ Unlike the old manual inquiry system, which depended on previous employers returning phone calls, the Clearinghouse is a single federal database updated within three business days of any reportable event.²

Under 49 C.F.R. § 382.701(a), an employer must conduct a full pre-employment query of the FMCSA Clearinghouse before hiring CDL drivers.³ Full queries require the applicant's specific electronic consent and show details about the applicant's drug and alcohol violations.⁴ Under § 382.701(b), employers must conduct a limited query of all CDL drivers they employ at least once per year.

Federal regulations distinguish between full and limited queries. A limited annual query shows only whether a new violation exists since the last query. A full query, required at hiring, shows the complete picture. Employer-carriers are permitted by regulation to run limited queries in order to fulfill their annual query obligation. However, as described by § 382.701(a)(2), carriers must conduct full queries prior to a driver's employment with the carrier.⁵

Federal regulations expressly prohibit any employer from allowing a driver to perform any safety-sensitive function if a Clearinghouse query reveals:

A verified positive controlled substances test result
An alcohol confirmation test of 0.04 or higher
A refusal to submit to testing
Actual knowledge of prohibited substance use⁶

The prohibition is not discretionary. A carrier that receives any of the above results, yet still allows the driver to operate, has knowingly violated a specific federal regulation.

Under 49 C.F.R. § 382.701(e), employers must retain query records and reports received from the Clearinghouse for at least three years.⁷ These records are available to investigators. A carrier that hired a driver without querying the Clearinghouse (also a federal regulation violation) should have a documented record of exactly what the carrier knew and when.

Clearinghouse Data Findings

The Clearinghouse has now been operational for over five years, and the accumulated data reveals something significant about the scope of the problem it was designed to address.

As of July 2025, more than 190,000 CDL drivers were in prohibited status, meaning approximately one in every 30 CDL holders registered in Clearinghouse is currently prohibited from driving.⁸ The share of prohibited drivers who have not started the return-to-duty process has remained consistently high since the Clearinghouse launched. Across its operating history, approximately two-thirds to three-quarters of prohibited drivers at any given point have not yet engaged with the SAP process.⁹ Drivers in “prohibited status” are legally barred from operating a commercial motor vehicle. As of November 18, 2024, having a prohibited Clearinghouse status results in losing or being denied a commercial driver's license or commercial learner's permit.¹⁰

Positive drug tests account for 81 percent of the total violations reported to the Clearinghouse.¹¹ Marijuana has consistently been the most common substance detected, followed by cocaine. The marijuana figure might reflect a persistent disconnect between state-level legalization and federal CDL prohibition. But regardless of state law, marijuana is a prohibited substance under the DOT drug testing program, and a positive result requires the same return-to-duty process as any other controlled substance.

The large pool of prohibited drivers who have not started the return-to-duty process represents a category of risk that is both documented and preventable. A driver who incurs a Clearinghouse violation cannot return to safety-sensitive functions (i.e., operating a commercial motor vehicle) until completing a structured return-to-duty process governed by 49 C.F.R. Part 40, Subpart O.¹²

The process involves five steps:

Initial Evaluation by a Substance Abuse Professional (SAP)
Completion of any treatment or education that the SAP recommends
A follow-up SAP evaluation
A negative return-to-duty drug or alcohol test
A follow-up testing plan that requires a minimum of six unannounced tests in the first twelve months following return to duty

The employer must report the negative return-to-duty test result to the Clearinghouse, and the driver's status only updates from “prohibited” to “not prohibited” once all steps are entered. Notably, the SAP controls the pace and scope of the evaluation and treatment recommendations. A driver who disagrees with the SAP's recommendations has no regulatory mechanism to override them.

Clearinghouse II: The CDL Suspension Enforcement Mechanism

The original Clearinghouse rule, effective January 2020, prohibited drivers with unresolved violations from operating commercial motor vehicles. But it relied on carriers to enforce that prohibition through the query process. Under the original rule, prohibited drivers were not automatically stopped from renewing their CDL or continuing to hold commercial driving privileges at the state level when drivers simply stopped working for regulated carriers.

The second Clearinghouse final rule, known as “Clearinghouse II,” closed that gap. As of November 18, 2024, CDL drivers with a prohibited status in FMCSA's Drug and Alcohol Clearinghouse now lose their state-issued commercial driving privileges until they complete the return-to-duty process.¹³ This requirement reflects a federal safety policy decision: drivers who cannot lawfully operate a commercial motor vehicle because they engaged in prohibited use of drugs or alcohol, or refused a drug or alcohol test, should not hold a valid CDL.

From the state's perspective, the mechanism is automatic. State driver licensing agencies must remove the commercial driving privileges from the driver's license of any individual subject to the CMV driving prohibition.¹⁴ Once a driver completes the return-to-duty process and the Clearinghouse status updates to “not prohibited,” the state licensing agency will allow reinstatement of commercial driving privileges.

The enforcement consequence matters for carrier liability analysis. Before November 2024, a prohibited driver could theoretically present a still-valid CDL to a new carrier, and a carrier that failed to query the Clearinghouse had no way of knowing the driver's prohibited status from the license itself. After November 2024, a carrier hiring a driver whose CDL was downgraded due to a Clearinghouse violation would be hiring a driver without a valid commercial license—a separate and independent disqualification. The layers of regulatory protection do not eliminate carrier responsibility to query; they multiply the consequences of the failure.

The Clearinghouse’s Retention Structure

One of the Clearinghouse's most important features from a hiring compliance standpoint is its retention structure. Violations do not quietly disappear after a short period of time has passed. The Clearinghouse maintains up to five years of data on violations, or until the return-to-duty process is complete, whichever is longer.¹⁵ If a driver does not complete the return-to-duty process, the violation information is maintained in the Clearinghouse indefinitely. So, even if a driver does complete the return-to-duty process, the violation will still stay in the Clearinghouse for five years.

The practical implication is significant: a driver who tested positive, left the industry without completing the return-to-duty process, and later attempted to re-enter trucking would carry that record in the Clearinghouse until the return-to-duty process is completed, regardless of how many years have passed.

There is no statute of limitations on the prohibition itself. Under 49 C.F.R. § 382, a driver's violation record becomes unavailable to employers only after:

The Substance Abuse Professional (SAP) reports completion of the return-to-duty process
The employer reports a negative return-to-duty test result
The driver has successfully completed all follow-up testing as prescribed
Five years have elapsed from the date of the violation

All four conditions must be satisfied. Meeting three out of four is not enough.¹⁶

In accordance with the final rule published in October 2021, a report of actual knowledge of prohibited drug or alcohol use such as a DUI citation involving a CMV will remain in the Clearinghouse for five years or until the driver completes the return-to-duty process, whichever is later, regardless of whether the driver is ultimately convicted of the offense.¹⁷ This means a DUI citation that is later dismissed still generates a Clearinghouse record. However, drivers who are not convicted of the offense may petition to submit documentary evidence of non-conviction to their Clearinghouse record. When FMCSA accepts the documentary evidence of non-conviction, it changes the driver's operating status in the Clearinghouse from “Prohibited” to “Not Prohibited.” The driver may then log in to their Clearinghouse account to verify the status change. Note that if the driver also has other outstanding violations, the status will not change to “Not Prohibited” until those are resolved as well.

Clearinghouse Records in Crash Investigations

When a crash involves potential driver impairment and the carrier employed a CDL driver, the Clearinghouse becomes a central evidentiary source in any subsequent investigation. The query history indicates whether the carrier queried before hiring, what the query showed, and whether the carrier queried annually thereafter. The history is documented in the carrier's own files and reflected in the Clearinghouse system.

A carrier that never queried has no defense. The regulation is explicit; the failure to query is its own violation of 49 C.F.R. § 382, regardless of what the query results would have revealed. Failing to comply with the FMCSA Drug and Alcohol Clearinghouse regulations can result in civil penalties of thousands of dollars per violation and can expose an employer to liability.¹⁸ If the employer fails to report violations or continues to allow a driver with drug and alcohol violations to drive without going through the SAP process, the employer potentially faces negligent hiring liability if the driver causes an accident and injures someone.

These are two distinct exposure categories. First, a carrier that fails to query, fails to report, or allows a prohibited driver to operate faces direct administrative fines per violation under 49 C.F.R. § 382.507.¹⁹ This is a pure regulatory penalty. Second, and separately, if that driver causes a crash and injures someone, the carrier's failure to use an available tool (i.e., Clearinghouse) that would have revealed the driver's prohibited status becomes evidence of negligent hiring or negligent retention in civil litigation. The regulatory violation does not itself create negligent hiring liability, but it does document that the carrier did not take required steps that would have revealed the risk.

A carrier that queried and found a violation, yet still allowed the driver to operate, also faces liability. The Clearinghouse record establishes that the carrier had actual, documented notice of the driver's prohibited status. The decision to place that driver in a truck was not an oversight or a paperwork gap. It was a choice made with knowledge of a specific federal record the regulation was designed to act on.

The annual query obligation also creates a continuing duty that runs through the employment relationship. A carrier that queried at hire and found no record, but never queried again in subsequent years, had no mechanism to learn about violations the driver accumulated while employed elsewhere or during periods of leave. Employers must conduct an annual query on current employees at least once per year as based on the date of the last query. The annual query requirement is tracked on a rolling 12-month basis.²⁰ A gap of more than twelve months in the query record is a documented compliance failure. This gap also evidences that the carrier did not have current information about the driver's status when the crash occurred.

Drug & Alcohol Clearinghouse