DOT drug test: Who, what, when and how


As directed by the Federal Motor Carrier Safety Administration (FMCSA) and the Department of Transportation (DOT), all CDL drivers and their employers are required to follow the rules related to DOT drug tests.

Who is given a DOT drug test?

Drivers of commercial motor vehicles (CMVs) are required to take a drug test and their employers must ensure their drivers are tested before operating a CMV.

Below is a full list of those required to be tested.

  • employers of CDL drivers operating CMVs on public roads
  • CDL drivers who operate CMVs on public roads
  • interstate motor carriers
  • intrastate motor carriers
  • federal, state, and local governments
  • civic organizations (disabled veteran transport, boy/girl scouts, etc.)
  • faith-based organizations

What substances are tested?

The DOT requires testing of alcohol and five drug classes, including:

  1. Marijuana
  2. Cocaine
  3. Opiates
  4. Amphetamines or methamphetamines
  5. PCP

Alcohol tests will identify alcohol in the system at .02 BAC and more.                      

Motor carriers can also implement a separate testing program in addition to, and distinct from, the required DOT testing program, under which they are able to test for other drugs.

What types of DOT drug tests are there and when are they given?

DOT drug and alcohol tests are given in several different scenarios, including:

  1. pre-employment – before starting work as a CDL driver and operating a CMV
  2. post-accident – drug and alcohol tests may be required after an accident depending on the circumstances. Learn when post-accident drug tests are required.
  3. random – random testing programs are required by law for all DOT-regulated motor carriers
  4. reasonable suspicion – if a driver appears to be under the influence of drugs or alcohol, an area in which supervisors must be trained in identifying.
  5. return-to-duty – required of drivers who tested positive, refused, or violated the law
  6. follow-up – required of drivers who tested positive, refused, or violated the law

What is the DOT drug testing process?

The DOT has a strict process for administering drug tests and the steps are the same for all six types.

  1. Go to the collection site with a valid ID and provide a sample before leaving.
  2. Provide your urine sample in the designated collection area. The collection process will be private unless required, as in a return-to-duty or follow-up test.
  3. When finished with the sample, provide the container to the collector and observe as they split the sample into two containers, seal them with tamper-evident tape and allow you to sign the tape before you leave.
  4. Provide your contact information and verify your name and date of birth so the Medical Review Officer (MRO) can get in touch with the results.

Drug and alcohol testing

Where does a driver get a DOT drug test?

Compliance Navigation Specialists works with Quest Diagnostics and have over 10,000 locations available for testing, whether it is necessary after an accident or for a pre-employment screening.

We also offer a comprehensive Drug and Alcohol Consortium Administration Services (C/TPA) for companies that are regulated by Federal and State government.

If you have any questions, call 888.260.9448 or email at info@cnsprotects.com.

DOT post-accident drug test requirements


As a DOT-regulated motor carrier, it is extremely important to ensure all CDL drivers are in top physical and mental condition while operating these highly complex and powerful commercial motor vehicles. Driver awareness of post-accident drug test requirements is also crucial.

Although we do everything possible to prevent accidents, there are times when circumstances are beyond our control, making the post-accident steps one of the most important pieces of knowledge for a CDL driver. A driver’s responsibilities do not stop at the site of the accident.

What are the different types of DOT drug tests?

There are several situations in which a DOT drug test is required, including:

  1. pre-employment – before starting work as a CDL driver
  2. post-accident – applies to certain situations following an accident
  3. random – random testing program require by law for all DOT-regulated motor carriers
  4. reasonable suspicion – if a driver appears to be under the influence of drugs or alcohol
  5. return-to-duty – required of drivers who tested positive, refused, or violated the law
  6. follow-up – required of drivers who tested positive, refused, or violated the law

When is a post-accident drug and alcohol test required?

Drug and alcohol tests are not required after every accident. A CDL driver is required to take a post-accident drug test if:

  • the accident results in one or more fatalities
  • injury was incurred that required medical treatment away from the scene and the driver received a citation (Note: no citation = no drug and alcohol test)
  • any vehicle is towed, and the driver received a citation (Note: no citation = no drug and alcohol test)

Also, it is important to note that a driver is still liable to take a drug and alcohol test if a citation issued within 32 hours of the accident. If a citation is issued after the 8 hour mark, the motor carrier must make a note saying “a citation was not issued until this time, which was after the 8 hours for alcohol testing.”

How much time do I have to get a post-accident drug test?

A driver has 2 hours in which an alcohol test should be completed, however it must be completed within 8 hours. If the driver goes over the 2-hour mark, they must provide an explanation as to why there was a delay and the motor carrier must provide a written explanation and keep in their company files.

A drug test needs to be completed as soon as possible; however, it must be completed within 32 hours. At times there might be a delay in the issuance of a citation, however as long as the citation is issued with 32 hours, a drug and alcohol test is required.

Drivers often run into issues with meeting these timeframes because they will be kept at the scene of an accident for several hours or an investigation must be completed to determine if the driver was at fault.

What if I miss the maximum time frame allowed?

If a driver does not get his post-accident drug test before the maximum allowed time, the company needs to make a note in their files as to the reason why, however it is too late and the company will be out of compliance and face fines and audit penalties, so completing the drug test within the allowed time is imperative.

What about on-site tests, such as a DUI test or breathalyzer?

If an officer conducts a DUI test or a breathalyzer at the scene of an accident, a driver is still required to follow protocol and get an official drug and alcohol test within the allotted time frames. An on-site test by an officer will not fulfill the required DOT post-accident drug test as these tests do not follow DOT rules and regulations.


Drug and alcohol testing

Where does a driver get a DOT drug test?

Compliance Navigation Specialists works with Quest Diagnostics and have over 10,000 locations available for testing, whether it is necessary after an accident or for a pre-employment screening.

For post-accident alcohol testing, CNS will coordinate a location for you.

We also offer a comprehensive Drug and Alcohol Consortium Administration Services (C/TPA) for companies that are regulated by Federal and State government.

If you have any questions, call 888.260.9448 or email at info@cnsprotects.com.