49 CFR 40.271: Correcting alcohol testing problems
Last reviewed: October 14, 2026
This section covers how alcohol testing problems are corrected. A BAT or STT must try to complete each test and fix any problem that would cancel it. If the problem cannot be corrected, the test must be cancelled.
Applies toIt applies to a BAT or STT, and to an employer or other service agent administering the testing process, and to the DER who receives a notice that a test could not be completed.
What it says
A BAT or STT must try to correct promptly, if practicable, any event that will cause a test to be cancelled, and may repeat the testing process to do so.
49 CFR 40.271(a)(1)“you must try to correct the problem promptly, if practicable. You may repeat the testing process as part of this effort.”
If a test must be repeated, the BAT or STT must begin a new test as soon as possible, using a new ATF, a new sequential test number, and, if needed, a new ASD and/or a new EBT.
49 CFR 40.271(a)(2)“you must begin a new test as soon as possible. You must use a new ATF, a new sequential test number, and, if needed, a new ASD and/or a new EBT.”
The number of attempts to complete a repeated test is not limited, provided the employee is making a good faith effort to comply with the testing process.
49 CFR 40.271(a)(3)“you are not limited in the number of attempts to complete the test, provided that the employee is making a good faith effort to comply with the testing process.”
If no other testing device is available at the testing site for the new test, the BAT or STT must immediately notify the DER that the test could not be completed.
49 CFR 40.271(a)(4)“you must immediately notify the DER and advise the DER that the test could not be completed.”
A DER who receives that notice must make all reasonable efforts to ensure the test is conducted at another testing site as soon as possible.
49 CFR 40.271(a)(4)“you must make all reasonable efforts to ensure that the test is conducted at another testing site as soon as possible.”
An STT, BAT, employer or other service agent who becomes aware of a correctable flaw that has not been corrected must take all practicable action to correct it so the test is not cancelled.
49 CFR 40.271(b)“you must take all practicable action to correct the problem so that the test is not cancelled.”
If a problem came from omitted required information, the person responsible for that information must supply it in writing, with a signed statement that it is true and accurate.
49 CFR 40.271(b)(1)“supply in writing the missing information and a signed statement that it is true and accurate.”
If the problem is use of a non-DOT form, the responsible person must supply the required certification and statement on the same business day on which they are notified of the problem, by fax or courier.
49 CFR 40.271(b)(2)“You must supply this information on the same business day on which you are notified of the problem, transmitting it by fax or courier.”
If the problem cannot be corrected, the test must be cancelled.
49 CFR 40.271(c)“If you cannot correct the problem, you must cancel the test.”
Common questions
Is there a limit on how many times an alcohol test can be repeated?
No. The number of attempts is not limited, as long as the employee is making a good faith effort to comply with the testing process.
“you are not limited in the number of attempts to complete the test, provided that the employee is making a good faith effort to comply with the testing process.”
What happens if no other testing device is available for a new alcohol test?
The BAT or STT must immediately notify the DER that the test could not be completed. The DER must then make all reasonable efforts to have the test conducted at another testing site as soon as possible.
“If another testing device is not available for the new test at the testing site, you must immediately notify the DER and advise the DER that the test could not be completed.”
When must an alcohol test be cancelled?
A test must be cancelled if the problem cannot be corrected.
“If you cannot correct the problem, you must cancel the test.”
How fast must the paperwork be supplied if a non-DOT form was used?
The information must be supplied on the same business day on which the person is notified of the problem. It must be sent by fax or courier.
“You must supply this information on the same business day on which you are notified of the problem, transmitting it by fax or courier.”
The text of 49 CFR 40.271
Electronic Code of Federal Regulations (eCFR), current as of March 31, 2026 · Read it on eCFR
How are alcohol testing problems corrected?
(a) As a BAT or STT, you have the responsibility of trying to complete successfully an alcohol test for each employee.
(1) If, during or shortly after the testing process, you become aware of any event that will cause the test to be cancelled (see § 40.267), you must try to correct the problem promptly, if practicable. You may repeat the testing process as part of this effort.
(2) If repeating the testing process is necessary, you must begin a new test as soon as possible. You must use a new ATF, a new sequential test number, and, if needed, a new ASD and/or a new EBT. It is permissible to use additional technical capabilities of the EBT (e.g., manual operation) if you have been trained to do so in accordance with § 40.213(c) .
(3) If repeating the testing process is necessary, you are not limited in the number of attempts to complete the test, provided that the employee is making a good faith effort to comply with the testing process.
(4) If another testing device is not available for the new test at the testing site, you must immediately notify the DER and advise the DER that the test could not be completed. As the DER who receives this information, you must make all reasonable efforts to ensure that the test is conducted at another testing site as soon as possible.
(b) If, as an STT, BAT, employer or other service agent administering the testing process, you become aware of a “correctable flaw” (see § 40.269) that has not already been corrected, you must take all practicable action to correct the problem so that the test is not cancelled.
(1) If the problem resulted from the omission of required information, you must, as the person responsible for providing that information, supply in writing the missing information and a signed statement that it is true and accurate. For example, suppose you are a BAT and you forgot to make a notation on the “Remarks” line of the ATF that the employee did not sign the certification. You would, when the problem is called to your attention, supply a signed statement that the employee failed or refused to sign the certification after the result was obtained, and that your signed statement is true and accurate.
(2) If the problem is the use of a non-DOT form, you must, as the person responsible for the use of the incorrect form, certify in writing that the incorrect form contains all the information needed for a valid DOT alcohol test. You must also provide a signed statement that the incorrect form was used inadvertently or as the only means of conducting a test, in circumstances beyond your control, and the steps you have taken to prevent future use of non-DOT forms for DOT tests. You must supply this information on the same business day on which you are notified of the problem, transmitting it by fax or courier.
(c) If you cannot correct the problem, you must cancel the test.
Sections it refers to
The plain-English explanation on this page was written with AI from the regulation text above and checked automatically before publishing: every quote appears in the text, every number comes from it, and a second model confirmed each statement adds nothing the text doesn't say. Regulation text current as of March 31, 2026. The regulation text governs. RegKnot is not affiliated with the U.S. Coast Guard.