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What Happens When You Are Selected for a DOT Random Test

Selection is unannounced and random. Here is what to expect, what to do right away, and what is at stake.

Medically reviewed by Chantal Gabriel, MD Updated October 2026

Being picked for a random test does not mean anyone suspects you. Selection is automatic and random, which is why the rules require it to be unannounced.

If you are selected: go to the collection site right away. Do not wait until the end of your shift or until you have time.

How selection works

Your consortium (C/TPA) pools drivers from many companies and draws names with a scientifically valid random method. The federal minimum annual testing rates are 50% for drug testing and 10% for alcohol testing across the pool. You may be picked once, more than once, or not at all in a year.

What happens step by step

  1. You are notified by your employer or consortium that you were selected.
  2. You go immediately to a collection site with your testing order.
  3. You show photo ID and give the sample (or take the breath test, for alcohol).
  4. The lab and the MRO review the result, and you and your employer are notified. A negative result completes the test.

What to bring

What a refusal means

Refusing a random test, failing to show up, or leaving before the test is finished counts as a violation, treated like a positive result. You are removed from safety-sensitive work and must complete the return-to-duty process before driving again.

How the consortium helps

A consortium runs the draw, notifies you, arranges the test and keeps your records for audits. Join the WorkOccMed consortium from $49 per year per driver, or read how the cost works in our consortium cost guide.

Frequently asked questions

What should I do if I am selected for a random test?

Go to the collection site right away. Federal rules require a selected driver to proceed immediately to the test.

What do I need to bring?

Bring a valid photo ID, and follow the instructions on your testing order.

Can I choose when to test?

No. Random tests are unannounced. You cannot pick the day, and you should not wait.

What if I refuse or do not go?

A refusal to test is treated as a violation, in the same way as a positive result. You would be removed from safety-sensitive duty and have to complete the return-to-duty process.

Related guides

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