Timing drug and alcohol tests is not a random act
The element of surprise built into DOT random testing helps catch impaired drivers. So, the timing of driver notifications is vitally important.
To ensure random selections are kept confidential and unannounced, DOT regulations specify how to carry out testing. A misunderstanding of these requirements can create a messy situation and may inadvertently create a violation.
Consider the following random-notification scenarios and the issues each produces.
‘Go when you have time’
Scenario: Samantha was selected for a random DOT drug and alcohol test. Her supervisor informed her about the test at the beginning of her shift. She was told she had two hours to show up for her appointment at a clinic that’s 15 minutes away.
Notification error: Drivers don’t have a “window of time” to show up for random tests. The regulations require that drivers immediately proceed to the collection site once they’re notified of a random drug or alcohol test. Giving drivers a cushion (other than travel time) is considered advance notice. In fact, this type of heads-up could:
- Provide a driver with enough time to come up with a substituted urine sample or consume a drug-masking substance.
- Keep a driver from engaging in prohibited behavior (e.g., drug or alcohol use) that they would have otherwise.
- Allow enough time for alcohol to metabolize in the driver’s body.
Drivers CANNOT be given an hour or two to show up at the collection site, and they can’t wait until later or at the end of their shift when it’s more convenient.
Alcohol tests and SSFs
Scenario: Phil is a warehouse employee who occasionally fills in as a driver. He’s in the random pool and was selected for alcohol testing.
Today, Phil is scheduled to work solely in the warehouse operating a forklift. The safety manager approaches Phil and instructs him to go for a DOT alcohol test. Phil goes for testing and blows 0.00% BAC, indicating he was not impaired. All’s good, right? Not quite.
Notification error: Since alcohol is a legal substance, prohibited use is timed around performing safety-sensitive functions (SSFs). A random alcohol test can only be requested right before, during, or right after performing SSFs.
If a driver is working in another capacity at the motor carrier (e.g., working in the warehouse) with no expectation of operating a CDL vehicle, they’re not performing SSFs. The motor carrier is unable to arrange DOT alcohol testing during this shift. The notification must wait until the driver is scheduled to operate or is in readiness to operate a vehicle requiring a CDL.
In this case, the safety manager caught a break — the test was negative. Had Phil’s test result been at least 0.04% BAC, the error would have resulted in a DOT testing violation. The carrier’s designated employer representative (DER) would decide whether to report the failed test to the Clearinghouse or work to cancel the test due to the error.
‘I never received a text’
Scenario: Robert, the company’s DER, received the quarterly list of randomly selected drivers. Randy was selected for drug testing, and Robert knows Randy should be available for testing shortly. Randy just dropped off his load and is on his way back to the terminal, which is about an hour’s drive. Robert texts Randy with instructions to immediately proceed to ABC Clinic which is close to the drop off. Randy doesn’t respond to the text.
The clinic calls Robert stating that Randy never showed up. An hour later, Randy shows up at the motor carrier and is clocking out for the day. Robert asks Randy, “Why didn’t you go for your random drug test? I texted you!” Randy states, “I never got a text.”
Best practice: The regulations don’t restrict the use of electronic notifications. However, in this scenario, Robert is in a difficult position. Does he consider this a refusal to test or take Randy’s word? As DER, he must decide.
Use of text, voicemail, or email isn’t the best choice for remote notifications of random testing. A documented phone call where you speak with the driver backs up any claims of refusal to test.
Notification tips
Your random drug and/or alcohol notifications may require planning. You don’t want to set your driver up for failure or to create a motor carrier violation through improper procedures.
Avoid messy situations:
- Instruct front-line managers on the regulatory basics.
- Prevent scheduling conflicts (e.g., childcare, personal appointments):
- Don’t notify drivers at the end of their shift if the test may extend into the driver’s free time;
- Check the driver’s time-off requests (e.g., doctor’s appointment, leaving early for the day, etc.); and
- Avoid an off-duty notification policy.
- Remind drivers during notification to immediately proceed to the clinic, so there is never a doubt.
- Use the company policy to ensure:
- Drivers know what “immediate” means, and
- The DER knows what constitutes a refusal to test.
Key to remember: The element of surprise for random tests helps uncover CDL drivers’ drug use or alcohol misuse. But your timing of these random tests should be far from random.



















































