Drug and Alcohol Clearinghouse Queries: Full, Limited and Annual

Three obligations, two kinds of query, and one deadline measured in hours. It is not complicated, but it is one of the things a safety audit checks and one that single-truck carriers routinely miss entirely.

What the Clearinghouse holds

The Drug and Alcohol Clearinghouse is FMCSA's database of drug and alcohol program violations by CDL and CLP holders. It records verified positive, adulterated or substituted drug test results, alcohol confirmation results of 0.04 or higher, refusals to test, and employer reports of actual knowledge of prohibited alcohol or drug use, together with the return-to-duty steps that follow: the substance abuse professional's report, the negative return-to-duty test and completed follow-up testing.

Employers report violations by the end of the third business day after receiving the result or gaining actual knowledge. A violation stays visible to querying employers until five years have passed since the violation determination and the driver has completed return-to-duty and follow-up testing, whichever comes later.

The two kinds of query

	Full query	Limited query
What it returns	All information held on the driver	Only whether information exists
Consent	Specific consent given electronically by the driver inside the Clearinghouse	General written or electronic consent, which may last beyond one year
Used for	Pre-employment, and following a positive limited query	The annual check
Cost	$1.25	$1.25 (a limited query followed by a full query is charged once)

Because full-query consent is given inside the Clearinghouse, the driver needs a Clearinghouse account to give it. Keep the signed limited-query consent for three years from the date of the last query. If a driver refuses either consent, you may not let them perform safety-sensitive functions.

The three obligations

1. Before the driver performs safety-sensitive functions

A full query is required before you employ a driver in a safety-sensitive role. It needs the driver's specific consent, given in the Clearinghouse itself. Since January 6, 2023 this query is also how you obtain the drug and alcohol history from previous employers that the driver qualification rules require.

2. Once every twelve months, for every driver

An annual query is required at least once a year for each driver subject to testing. It may be a limited query, which is what most carriers use because the consent can be given once and cover more than a single year.

3. Within 24 hours, if the limited query comes back positive

If a limited query indicates that information exists, you must conduct a full query within 24 hours. Until that full query is completed and shows no prohibition, the driver may not perform safety-sensitive functions.

That 24-hour clock is the part that catches people. A limited query does not tell you what the record says — only that there is one. Running the annual queries on a Friday afternoon and going home is how a carrier ends up with a driver working who should not be.

One more thing works in your favour: if a violation is entered against a driver within 30 days after your query, FMCSA notifies you.

What a prohibited record means

A driver with an unresolved violation may not perform safety-sensitive functions. The exceptions are narrow: the driver has completed the substance abuse professional process and a negative return-to-duty test, and either finished the follow-up testing plan or the new employer takes over managing it.

Since November 18, 2024, state driver licensing agencies must also remove commercial driving privileges from drivers in prohibited status, until the return-to-duty process is complete and the Clearinghouse status changes to “not prohibited.” A prohibited record now affects the licence, not just the job.

What this means for an owner-operator

If you drive under your own authority, you are both the employer and the driver, and FMCSA expects you to meet both sets of Clearinghouse requirements. The regulations require an owner-operator to designate a consortium or third-party administrator (C/TPA) for the employer-side work, and the Clearinghouse will not let you take any action until you have done so.

Register as an employer, linked to your USDOT number.
Register as a driver, so you can respond to consent requests.
Designate your C/TPA in the Clearinghouse, and update it within 10 days if you change providers.
Buy your own query plan. C/TPAs cannot buy queries for you; you buy them, and the C/TPA uses them.
Make sure the queries actually run — at least once a year on every CDL driver you employ, yourself included, and a full pre-employment query on anyone you take on.

In practice this is bundled with the drug and alcohol testing consortium you already need to join, and the administrator handles the queries and reporting. What you must do is make sure it is actually set up, and keep the evidence.

A worked example

A three-truck fleet hires a fourth driver in May and runs annual queries every January. The May hire needs one full query before the first dispatch. In January the carrier runs four limited queries, one per driver, for $5.00. One comes back showing information exists. The carrier runs the full query that morning (no extra charge), finds an unresolved violation, and takes the driver off safety-sensitive work until the return-to-duty process is complete. Every query record and the consents go into the carrier's files and are kept three years.

Where it shows up in an audit

Clearinghouse queries sit inside the drug and alcohol testing area examined in a new entrant safety audit. Failing to implement a testing programme at all is one of the automatic-failure conditions, and so is using a driver known to have refused a test or tested positive. The evidence an auditor wants is documentary: the consortium enrolment, the query records, the consents.

Query records and the information received must be kept for three years; an employer with a valid Clearinghouse registration meets that through the system's own records, but a local copy costs nothing.

Common mistakes

Assuming the consortium bought the queries. It cannot; the plan has to be in your account.
Hiring a driver who has no Clearinghouse account and letting them start before the full-query consent arrives.
Treating the annual limited query as optional for long-serving drivers.
Letting the C/TPA designation lapse after switching providers.

A workable routine

Query on hiring, before the first dispatch. Not after.
Put every driver's annual query on the same calendar date, so it is one task a year rather than a rolling set you forget.
Do it on a morning, not a Friday evening, so the 24-hour rule is workable if something comes back.
Keep the query receipts and consents with the driver qualification file.

Frequently asked questions

What is the difference between a full and a limited query?

A full query returns the information held on the driver and requires specific consent given in the Clearinghouse. A limited query only reveals whether information exists, and its consent can cover more than one year.

How often must I run an annual query?

At least once every twelve months for every driver subject to testing.

What if a limited query shows information exists?

You must run a full query within 24 hours, and the driver may not perform safety-sensitive functions until it is completed and shows no prohibition.

How does an owner-operator meet this?

By registering as both employer and driver, designating a consortium or third-party administrator, and buying a query plan that the administrator uses to run the queries.

How much does a query cost?

A flat $1.25 per query, limited or full. When a limited query is followed by a full query on the same driver, the employer is charged once. Query bundles do not expire.

Clearinghouse Queries: Full, Limited and Annual