49 CFR 40.25 requires every employer covered by Department of Transportation drug and alcohol testing rules to investigate an applicant’s testing history before that person performs any safety-sensitive work. You must contact each DOT-regulated employer the applicant worked for during the previous two years, collect records of any drug or alcohol violations, and get the applicant’s written consent to do so.1US Department of Transportation. 49 CFR Part 40 Section 40.25 If the applicant refuses to authorize the release of that history, you cannot let them perform safety-sensitive duties at all.
Who the Rule Applies To
Section 40.25 reaches employers and employees regulated by any of the DOT operating administrations:
- FMCSA (Federal Motor Carrier Safety Administration): commercial trucking and bus operations
- FAA (Federal Aviation Administration): flight crews, maintenance, air traffic control
- FRA (Federal Railroad Administration): railroad operations
- FTA (Federal Transit Administration): public transit systems
- PHMSA (Pipeline and Hazardous Materials Safety Administration): pipeline operations
The obligation is triggered whenever someone begins safety-sensitive duties for the first time with your company. That covers brand-new hires and existing employees moving into a safety-sensitive role for the first time.1US Department of Transportation. 49 CFR Part 40 Section 40.25 Safety-sensitive functions are broadly those jobs where impaired performance could endanger the public, such as driving a commercial vehicle, dispatching trains, or maintaining aircraft.
Records You Have to Request
Contact every DOT-regulated employer that employed the applicant in a safety-sensitive capacity during the two years before the application or transfer. The lookback is two years, not three.2eCFR. 49 CFR 40.25 The applicant must give written consent before any previous employer can release information. Without that consent, the person cannot perform safety-sensitive work for you.
The specific records you must ask for:
- Any verified positive drug test result
- Any alcohol confirmation test at 0.04 concentration or higher
- Documented refusals to test, including adulterated or substituted specimens
- Any other breach of a DOT agency’s drug and alcohol testing rules
- If the employee had a violation, documentation showing whether they completed the return-to-duty process and any follow-up testing1US Department of Transportation. 49 CFR Part 40 Section 40.25
Ask the Applicant Directly, Too
Beyond contacting previous employers, you must ask the applicant whether they tested positive or refused a test on any pre-employment drug or alcohol test during the past two years, even for jobs they applied to but never actually started. If the applicant admits to a positive result or refusal, you cannot assign them safety-sensitive duties until they document completion of the return-to-duty process.2eCFR. 49 CFR 40.25 A records request to a prior employer would not surface these situations, because the applicant never actually worked there.
The FMCSA Clearinghouse Requirement
If you are regulated by FMCSA, calling and writing previous employers is not enough on its own. FMCSA-regulated employers must also query the FMCSA Drug and Alcohol Clearinghouse as part of Section 40.25 compliance.1US Department of Transportation. 49 CFR Part 40 Section 40.25 The Clearinghouse is a centralized federal database of drug and alcohol violations for commercial motor vehicle drivers.
Before hiring any driver for safety-sensitive work, run a full pre-employment query. A full query requires the driver’s specific electronic consent inside the Clearinghouse system and releases all violation records to you.3FMCSA. What Consent Process Full and Limited Queries You must also run at least one query per year on every driver currently performing safety-sensitive functions. For the annual check, a limited query is allowed if the driver gave general written consent. A limited query only reports whether records exist. If it comes back with a hit, you have 24 hours to conduct a full query or immediately pull the driver from safety-sensitive duties.4eCFR. 49 CFR 382.701
The Clearinghouse covers only FMCSA-regulated violations. If your applicant also worked in a role regulated by a different DOT agency, such as a pipeline job under PHMSA, you still have to run the traditional Section 40.25 records request for that non-FMCSA employment.1US Department of Transportation. 49 CFR Part 40 Section 40.25
Deadlines for Getting and Releasing Records
You are expected to obtain and review the testing history before the employee ever performs safety-sensitive work. When that is not feasible, get the information as soon as possible. The hard deadline: the employee cannot continue performing safety-sensitive duties past 30 days from their start date unless you have either obtained the records or documented a good-faith effort to obtain them.1US Department of Transportation. 49 CFR Part 40 Section 40.25
On the other side, a previous employer that receives a properly consented request must release the records immediately. The regulation uses the word “immediately,” with no grace period.2eCFR. 49 CFR 40.25 DOT guidance reinforces that previous employers are required to provide the information right away.5US Department of Transportation. 49 CFR Part 40 Section 40.25 Questions and Answers All records must be transmitted in a written format that preserves confidentiality, by email, fax, or letter.
When a Previous Employer Will Not Respond
The regulation does not carve out an exception for employers that have gone out of business or simply ignore the request. Instead, the good-faith-effort provision carries the weight. If you cannot get the records despite reasonable attempts, document what you tried: the dates of your requests, the methods you used, and any responses you received. That paper trail is what lets the employee keep working past the 30-day mark.1US Department of Transportation. 49 CFR Part 40 Section 40.25 A verbal “we tried calling them” with nothing in writing does not satisfy the regulation.
If the Records Show a Violation
When the history reveals that the applicant violated any DOT drug or alcohol regulation, you must immediately remove them from safety-sensitive duties. No exceptions, no waiting period. The employee stays off safety-sensitive work until you obtain documentation showing they completed the return-to-duty process under Subpart O of Part 40.1US Department of Transportation. 49 CFR Part 40 Section 40.25 That process runs through a Substance Abuse Professional evaluation, any prescribed education or treatment, a follow-up SAP evaluation, and a negative return-to-duty test, followed by a SAP-prescribed follow-up testing schedule that the employer is responsible for carrying out.6Cornell Law School Legal Information Institute. 49 CFR Part 40 Subpart O – Substance Abuse Professionals and the Return-to-Duty Process
Timing catches some employers off guard. If a previous employer does not respond initially but later sends adverse information after the employee has already started working, you must pull the employee from safety-sensitive duties at that point. Weeks of incident-free work do not override the requirement.
Recordkeeping on Both Sides
You must maintain a confidential written record of all information obtained, or of the good-faith efforts made to get it. Keep those records for three years from the date the employee first performed safety-sensitive duties.1US Department of Transportation. 49 CFR Part 40 Section 40.25
A previous employer releasing records has its own obligation: keep a written log of what was released, including the date, the identity of the requesting party, and a summary of the information provided.2eCFR. 49 CFR 40.25 Because the information is sensitive, both sides need to store it securely and transmit it using methods that prevent unauthorized disclosure.
Consequences of Skipping the Check
Failing to run the pre-employment history check is more than a paperwork problem. An employer that skips the process and later has an employee involved in a safety incident faces DOT enforcement action for the regulatory violation itself. Civil exposure is the larger risk. If an employee with an undiscovered drug or alcohol violation causes an accident, the missing background check becomes evidence in a negligent hiring lawsuit, with the plaintiff arguing that a basic records request would have kept that person out of the driver’s seat.
Previous employers that stall carry risk too. Because the regulation uses “immediately” to describe the release obligation, an unresponsive previous employer is itself out of compliance with federal rules. Treating these requests as a low priority is a mistake on either side of the transaction.