How to Run a Safety Performance History Investigation Under §391.23

Of all the documents in a driver's hiring package, the safety performance history investigation is the one carriers most often get partially right. The MVR gets pulled, the road test gets done - and the previous-employer inquiry gets a single fax that nobody follows up on. On an FMCSA audit, that half-step reads the same as no step at all, because 49 CFR §391.23 does not just require asking. It requires asking the right employers for the right data elements, documenting every contact and every silence, finishing inside a 30-day window, and filing the results in a specific, access-controlled file most carriers have never heard of: the §391.53 driver investigation history file.

This guide is the full request-to-file workflow.

What the regulation requires

49 CFR §391.23(a)(2) - An investigation of the driver's safety performance history with Department of Transportation regulated employers during the preceding three years.

49 CFR §391.23(d) - The prospective motor carrier must investigate, at a minimum, the information listed in this paragraph from all previous employers of the applicant that employed the driver to operate a CMV within the previous three years: (1) general driver identification and employment verification information, and (2) the data elements as specified in §390.15(b)(1) for accidents involving the driver that occurred in the three-year period preceding the date of the employment application.

Two scopes hide in that text. The accident investigation under (d) goes to every previous employer for whom the driver operated a CMV - DOT-regulated or not. The drug-and-alcohol investigation under (e) goes to previous DOT-regulated employers whose drivers were subject to Part 40 testing. In practice the request letter covers both and the previous employer answers what applies.

The accident record means accidents as defined by §390.5 - a CMV crash involving a fatality, an injury treated away from the scene, or a vehicle towed from the scene - reported with the §390.15(b)(1) data elements (date, location, deaths, injuries, hazmat release). Previous employers may also volunteer their internally-retained minor accident data under §391.23(d)(2)(ii); take it if offered.

Step 1: Build the employer list from the application

The §391.21 application requires the driver to list every employer from the preceding three years (and CMV employers back ten). Cross-check the list against the gaps: an unexplained eight-month hole in the timeline is either unemployment, non-CMV work, or an employer the driver would rather you not call. Get a written explanation for every gap before sending requests.

Step 2: Send the requests - with specific return instructions

§391.23(d) requires the investigation request to "contain specific contact information on where the previous motor carrier employers should send the information requested." A request without a return address, fax, or email is non-compliant on its face. The method is otherwise flexible:

49 CFR §391.23(c)(2) - The investigation may consist of personal interviews, telephone interviews, letters, or any other method for investigating that the carrier deems appropriate.

Attach the driver's drug-and-alcohol release meeting §40.321(b) when the request goes to a DOT-regulated employer covered by paragraph (e) - and know that under §391.23(f)(1), a driver who refuses that consent cannot be allowed to operate a CMV for you at all.

Step 3: Apply the Clearinghouse rule to the drug-and-alcohol portion

49 CFR §391.23(e)(4) - As of January 6, 2023, employers subject to §382.701(a) must use the Drug and Alcohol Clearinghouse to comply with the requirements of this section with respect to FMCSA-regulated employers.

Translation: for FMCSA-regulated previous employers, the Clearinghouse full pre-employment query you already run under §382.701(a) is the drug-and-alcohol investigation - no separate letters needed. Two carve-outs remain manual:

• If the applicant is partway through a follow-up testing plan, request the plan directly from the previous employer under §40.25(b)(5).
• If a previous employer was regulated by a DOT mode other than FMCSA (FAA, FRA, FTA, PHMSA, USCG), the Clearinghouse does not hold their data - request the alcohol and controlled substances history directly (§391.23(e)(4)(ii)).

The accident and employment-verification portion under (d) is untouched by this rule. The Clearinghouse never answers "did this driver have a recordable crash" - only direct contact does.

Step 4: Document everything - including the silence

49 CFR §391.23(c)(2) - Each motor carrier must make a written record with respect to each previous employer contacted, or good faith efforts to do so. The record must include the previous employer's name and address, the date the previous employer was contacted, or the attempts made, and the information received about the driver from the previous employer. Failures to contact a previous employer, or of them to provide the required safety performance history information, must be documented.

This paragraph is the audit. A compliant record for a non-responsive employer looks like: three dated contact attempts across different channels, a note that no response was received, and - per §391.23(c)(3) - a copy of the complaint filed with FMCSA through the §386.12 process, kept as part of the good-faith documentation. For a driver with no DOT-regulated employment in the prior three years, §391.23(c)(4) requires the opposite document: a note that no investigation was possible.

Previous employers, for their part, are under their own mandate:

49 CFR §391.23(g)(1) - Previous employers must respond to each request for the DOT defined information in paragraphs (d) and (e) of this section within 30 days after the request is received. If there is no safety performance history information to report for that driver, previous motor carrier employers are nonetheless required to send a response confirming the non-existence of any such data.

When your own former drivers' new employers come calling, that 30-day response clock, the accuracy duty, and the one-year request log in §391.23(g)(4) apply to you.

Step 5: Hit the 30-day window

49 CFR §391.23(c)(1) - Replies to the investigations of the driver's safety performance history, or documentation of good faith efforts to obtain the investigation data, must be placed in the driver investigation history file within 30 days of the date the driver's employment begins.

The clock starts on the employment start date, not the application date or the offer date. The driver's due-process review-and-rebuttal timeline is explicitly "separate and apart" from this 30-day requirement - you do not get extra documentation time because a driver disputed a record.

Step 6: File it in §391.53 - not the DQ file

The responses land in the driver investigation history file, which is a different artifact from the §391.51 DQ file:

• It must be kept in a secure location with controlled access, limited to people involved in the hiring decision (§391.53(a)).
• The carrier's insurer may see it - except the alcohol and controlled substances data, which the insurer may never see.
• The data may be used only for the hiring decision.
• It must contain the driver's written drug-and-alcohol release and every response or documented good-faith effort.
• Retention matches the DQ file: as long as the driver is employed, plus three years (§391.53(c)).

Dropping previous-employer drug-and-alcohol responses loose into a DQ file that dispatchers can open is itself a compliance problem. Keep the two files physically or digitally separate.

The driver's due-process rights

§391.23(i)-(j) give the applicant four enforceable rights, and you must notify the driver of them in writing before any hiring decision: the right to review the information previous employers provided (on written request, delivered within 5 business days of your receipt of the request or of the data, whichever is later); the right to have errors corrected by the previous employer, who then re-sends corrected data; the right to attach a rebuttal statement when the previous employer refuses to correct; and the right to report non-cooperative previous employers to FMCSA under §386.12. The previous employer has 15 days to either correct data or tell the driver it will not, and 5 business days to forward a rebuttal it receives.

Frequently asked questions

How far back does the safety performance history investigation go?

Three years from the date of the employment application. The accident-record request goes to every employer for whom the driver operated a CMV in that period; the drug-and-alcohol request applies to DOT-regulated employers from the same window.

What if a previous employer never responds?

Document your good-faith effort - dated attempts, channels used, no-response note - and report the non-responsive employer to FMCSA using the §386.12 complaint process, keeping a copy in the §391.53 file. A documented silence is compliant; an undocumented one is a violation.

Do I still have to ask previous employers about drug and alcohol history?

Mostly no. Since January 6, 2023, the §382.701(a) Clearinghouse full query covers drug-and-alcohol history from FMCSA-regulated previous employers. You still ask directly when the previous employer was regulated by a different DOT mode, and you still request a follow-up testing plan directly under §40.25(b)(5) when one is open.

Where do the responses get filed?

In the §391.53 driver investigation history file - a separate, secure, access-controlled file - not in the general §391.51 DQ file. Retention is the duration of employment plus three years.

Does the investigation have to be done before the driver's first dispatch?

The regulation gives you 30 days from the employment start date to complete the documentation. But the Clearinghouse query and the drug test that gate first dispatch run on a stricter before-any-safety-sensitive-function rule, and most carriers close the entire pre-employment checklist before the first load as a matter of risk control.

Where this fits in the screening stack

The safety performance history investigation is the one pre-employment step a records vendor cannot do for you - it is carrier-to-carrier correspondence. What FastDriverScreening covers is everything around it: the $60 MVR + CDLIS package that confirms the states and licenses behind the application, the $100 DOT Pre-Employment package whose §382.701(a) Clearinghouse query satisfies the §391.23(e)(4) drug-and-alcohol portion for FMCSA-regulated employers, and the optional $25 DQ File template with a previous-employer contact log formatted to the §391.23(c)(2) documentation elements.