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DOT Pre-Employment Drug Test: What the Rule Requires

Before a new CDL driver does any safety-sensitive work for you, the rules say you need a verified negative drug test on file. This guide covers the basic rule in 49 CFR 382.301, the narrow exception, the optional alcohol test, and what to do if a result comes back negative-dilute.

Updated September 28, 2026 · Checked against the federal regulations

The basic rule: negative result first

Under 49 CFR 382.301(a), a driver must take a DOT drug test before the first time they perform safety-sensitive functions for your company. Driving a commercial motor vehicle is one of those functions.

Taking the test is not enough. You cannot let the driver start until you have received a verified negative result from the Medical Review Officer (MRO) or your C/TPA. A collection receipt or a "the sample was sent to the lab" message does not count.

Part 382 covers drivers who need a CDL (or a Mexican or Canadian equivalent) to operate a commercial motor vehicle in commerce. If you employ yourself as a driver, you must follow both the employer and driver sides of the rule.

Test comes before the driver's first safety-sensitive function for you.
Wait for the verified negative result from the MRO or C/TPA.
Keep the result with your drug and alcohol records.

The one exception in 382.301(b)

You may skip the pre-employment drug test only if all three conditions below are true. If you cannot confirm every one of them, you must test.

If you use the exception, 382.301(c) says you must contact the driver's testing program and get and keep written information: the program's name and address, proof the driver was in it, proof it follows Part 40, proof the driver is qualified (including no refusals), the date of the last drug test, and the results of any tests in the last six months and any other violations.

If you use a driver no more than once a year, you must gather that information at least once every six months. Because of all this paperwork, many small carriers find it simpler to just order the test.

The driver was in a DOT drug testing program that meets Part 382 within the previous 30 days; and
While in that program, the driver either was drug tested within the past 6 months or was in the random testing program for the previous 12 months (both counted from the date of application with you); and
No prior employer you know of has a record of a DOT drug or alcohol rule violation by the driver in the previous six months.

Pre-employment alcohol testing is optional

Under 382.301(d), you may, but are not required to, do pre-employment alcohol tests. If you choose to, you must follow a set of rules.

Test every covered employee before their first safety-sensitive function, whether a new hire or a transfer.
Treat everyone the same. Do not test some drivers and skip others.
Test only after making a contingent offer of employment or transfer.
Use the Part 40 alcohol testing procedures.
Do not let the driver start unless the result is below 0.04 alcohol concentration.

What to do with a negative-dilute result

A dilute result means the urine was more watery than normal. 49 CFR 40.197 tells employers what to do, and it depends on what the MRO tells you.

If the MRO says the result was positive and dilute, it is treated as a verified positive. Do not send the driver for another test just because it was dilute.

If the MRO directs a recollection under direct observation (this happens when the creatinine level was from 2 to 5 mg/dL), you must do it right away.

For other negative-dilute results, you may, but do not have to, send the driver for a new test right away. It must not be observed unless there is another reason for observation. You must treat all employees the same, but you can set different policies for different test types, such as retesting pre-employment tests but not random tests. Tell employees your policy ahead of time.

If you send the driver for a retest, give as little advance notice as possible. The new test becomes the result of record. If the retest is also negative-dilute, you cannot make the driver test again because of dilution (unless the MRO directs an observed recollection). If the driver declines the retest you directed, that is a refusal.

Other pre-employment steps and what happens after a positive

The drug test is only one piece. Under 382.701(a) you must also run a full pre-employment query of the FMCSA Drug and Alcohol Clearinghouse, which requires the driver's specific consent. You must also check the driver's safety performance history with previous DOT-regulated employers under 391.23.

Under 40.191(a)(2), a driver who leaves the collection site before a pre-employment testing process begins has not refused the test. Once the process starts, leaving early can be a refusal.

If a pre-employment test is a verified positive, the MRO reports it to the Clearinghouse within 2 business days (382.705(a)). The driver cannot do safety-sensitive work for any employer until they complete the return-to-duty process in Part 40, Subpart O (382.503).

Pact Compliance can run the Clearinghouse queries and keep these records organized for small fleets.

Common questions

Can a new driver start driving while we wait for the drug test result?

No. Under 382.301(a), you must have a verified negative result from the MRO or C/TPA before the driver performs any safety-sensitive function for you, unless you properly use the 382.301(b) exception.

Is a DOT pre-employment alcohol test required?

No. Section 382.301(d) makes it optional. If you choose to do it, you must test every covered employee, test only after a contingent offer, follow Part 40 procedures, and require a result below 0.04.

The driver was tested at their last job two months ago. Do we still need to test?

Maybe not, but only if every condition in 382.301(b) is met: they were in a Part 382 testing program within the last 30 days, they were tested in the last 6 months or were in a random program for the last 12 months, and no known prior employer has a violation on record in the last 6 months. You must also get and keep the program records listed in 382.301(c).

What if the pre-employment result is negative-dilute?

Follow 40.197. If the MRO orders an observed recollection, do it right away. Otherwise a retest is your choice, but you must apply the same policy to everyone and tell employees in advance. The retest becomes the result of record.

Is it a refusal if an applicant walks out of the clinic?

Not if they leave before the pre-employment testing process begins (40.191(a)(2)). If they leave after it begins, the employer decides whether it is a refusal.

Sources

Want this handled for you? Pact Compliance runs the random pool, Clearinghouse queries and driver records for small fleets, online, with a one-minute video for every setup step. Start free · Watch how it works · 901-517-7450