49 CFR 391.23 requires you to document a driver's safety performance history—here's what auditors pull first

49 CFR 391.23(a)(2) mandates that you investigate and document every driver's safety performance history from all DOT-regulated employers for the three years immediately before hire, and auditors will request this file before they open the cabinet.

I've sat through audits where the investigator's first words were "Show me the prior-employer contact log." If it's missing, incomplete, or dated after the 30-day placement window, you've already got a violation. This isn't a "best practice"—it's a hard requirement with a specific clock.

You must contact every previous DOT employer and document the attempt, not just the result

49 CFR 391.23 requires a written record for each previous employer contacted, including the employer's name, address, date contacted, and the attempts made. The regulation lets you choose your method: phone, letter, email, or in-person interview. But there's no choice about documentation.

If a previous employer doesn't respond, silence is not a free pass. The absence of a response is itself a required document. You record the date you called, who you spoke to (or attempted to speak to), what you requested, and what came back—including nothing. Auditors pull the contact log first. Missing it is a §391.23 violation even if you made a good faith effort.

I've watched carriers argue, "We called three times and they never picked up." That's worth something—but only if you wrote down the dates and times. No log, no evidence. The burden is on you to prove you tried.

Safety performance history must include accidents, moving violations, and hours-of-service out-of-service orders from the prior three years

Previous employers must provide accident data as defined in 49 CFR 390.5, including accident details when possible. Any accident—preventable or not—goes in the file. So do moving violations the previous employer reports: speeding, reckless operation, safety violations. Hours-of-service violations that resulted in an out-of-service order must be captured too.

This is separate from the Motor Vehicle Record (MVR) inquiry. The MVR tells you the driver's current license status and any violations the state caught. The safety performance history tells you what the driver did on the job while under a previous employer's watch. Both go in the file. Both have a 30-day placement clock.

The Drug and Alcohol Clearinghouse now handles substance abuse history—you cannot skip it and call it good faith effort

As of January 6, 2023, you must query the FMCSA Drug and Alcohol Clearinghouse for all FMCSA-regulated previous employers. The query result—hit or no hit—must be documented and placed in the investigation history file.

Previous employers must also tell you if the driver failed to undertake or complete a substance abuse professional (SAP) rehabilitation program under 49 CFR 382.605. But the Clearinghouse query replaced the old method of calling every employer to ask about substance abuse history. You still contact previous employers for accident and violation data. You use the Clearinghouse for substance abuse and rehabilitation status. If you skip the Clearinghouse query, you have no defense. The regulation is explicit: you use the Clearinghouse, period.

Worked example: A new hire from Texas with prior employment in Oklahoma and Arkansas

You hire a driver on June 15, 2026. She worked for Heartland Logistics in Oklahoma City from January 10, 2023 to August 22, 2024, then for Ozark Regional Transport in Little Rock, Arkansas from September 5, 2024 to March 31, 2026. She was unemployed April through June 2026.

Here's what goes in the file and the timeline:

The 30-day clock runs from June 15 (first day of employment), not from the date you posted the job or received the application. You have until July 15 to place everything in the file. One day late is a violation.

The Clearinghouse query result matters. If it had shown a hit—a previous positive test or failed SAP program—you'd have had a very different hire/no-hire decision to make. But you still would have documented it.

All safety performance history must be placed in the investigation history file within 30 days of the driver's first day

The 30-day clock starts on the date employment begins, not on the date you post the job, not on the date you extend the offer. It starts on day one on the payroll.

Late placement is a violation even if you eventually get the documents. Auditors verify both the placement date (when you filed it in the DQF) and the document date (when the previous employer responded). If you hired someone June 15 and the Heartland contact letter didn't arrive until July 10, that's fine—you still place it by July 15. If the letter arrived June 20 but you filed it July 18, that's a violation.

A separate Motor Vehicle Record also has a 30-day placement clock but goes in the same investigation history file. Auditors check both clocks.

The driver has a right to dispute information in the file within five business days of notification

Before you hire, you must inform the applicant in writing that you will contact previous employers and use the information for hiring decisions. That's 49 CFR 391.23(f)(1)—not optional.

If a previous employer reports something negative—an accident, a violation—the driver can rebut it within five business days of notification. The previous employer must forward the driver's rebuttal to you and append it to the record. That rebuttal stays in the file for three years and must be disclosed to any future prospective employers who request safety performance history on that driver. A driver who disputes a reported speeding citation can submit documentation that the citation was later dismissed. That rebuttal becomes part of the permanent record and travels with the driver.

Safety performance history files must be retained for the length of employment plus three years after separation

The three-year clock starts on the driver's last day, not on the date you process termination paperwork. A driver who works for you from June 15, 2026 to March 31, 2029 means your retention obligation runs through March 31, 2032.

Files must be stored in a secure location with controlled access. Access is limited to hiring decision makers and those who control file access; your insurer may access the file except alcohol and controlled substance data. Destruction of the file before the three-year mark is a violation. I've seen carriers purge files after a driver leaves because they thought the driver was gone. That's how you get cited. The clock doesn't stop when the driver walks out the door.