Previous Employer Checks for CDL Drivers: The §391.23 Investigation

Picture a Monday hire. The driver passed the road test, the medical card is current, the Clearinghouse query came back clean, and dispatch already has a load for Wednesday. Three weeks later a letter arrives from the driver's carrier before last: two recordable accidents in the past eighteen months, neither of them on the application.

Nothing in that story is unusual, and nothing in it is a violation yet. The federal rule that governs it, 49 CFR 391.23, lets a carrier start a driver before every reply is back. What it does not allow is skipping the inquiry, losing the paper trail, or finding out on day 31 that nobody ever sent the request. This guide walks through the previous-employer part of the investigation the way a small fleet's safety desk actually runs it: who to contact, what to ask, what the clocks are and what goes in which folder.

Two inquiries, not one

Section 391.23 asks for two separate things on every new driver:

1. A motor vehicle record from every state that issued the driver a license or permit in the past three years.
2. A safety performance history investigation with each DOT-regulated employer the driver worked for in the past three years.

The MVR part is mechanical: order it, file it in the driver qualification file. This article is about the second part, which is the one carriers tend to treat as a formality and auditors tend to treat as a test of whether the hiring process exists at all.

There is an old exception for drivers continuously employed by the same carrier since before January 1, 1971. If you are hiring someone today, it does not apply.

What you are asking each employer for

The regulation spells out the content. From every previous employer that had the driver operating a commercial motor vehicle in the past three years, you need:

Two points in that table trip people up.

First, the Clearinghouse does not replace the employer letter. Since January 6, 2023, carriers that must query the Clearinghouse use it for drug and alcohol history from FMCSA-regulated employers. But accident history and employment verification still have to come from the employer itself. A clean Clearinghouse result tells you nothing about a jackknife in Wyoming last winter.

Second, a driver who spent part of the last three years at a transit agency, a railroad or an airline brings a different set of rules with them. Those employers do not report to the FMCSA Clearinghouse, so the drug and alcohol request goes to them directly under 49 CFR 40.25, together with the driver's signed consent.

If the driver is in the middle of a follow-up testing plan after a return-to-duty process, you also need that plan from the employer that holds it.

The clocks

Several deadlines run in parallel, and they belong to different people. Keeping them straight is most of the job.

The full text and the cross-references are in 49 CFR 391.23 on eCFR. It is worth reading once from top to bottom; it is shorter than most carrier handbooks.

Notice that the hiring carrier's 30 days starts at the date employment begins, not at the date the request went out. If you send requests on day 25, you have five days to collect replies or prove you tried. Send them the day the application arrives.

Running the investigation, step by step

Here is a sequence that works for a fleet with one or two people handling safety and recruiting.

1. Get the application right. The employment application under §391.21 lists the driver's employers. For a CDL driver it covers the past three years plus seven more years of commercial driving employers. Only the three-year window is part of the §391.23 investigation, but the longer list helps you spot gaps and match names. The application, or a separate document the driver signs, should also carry the written notice of the driver's rights to review, correct and rebut. That notice has to be given before you decide to hire.

2. Collect consent. The drug and alcohol part needs the driver's specific written consent meeting 49 CFR 40.321(b), and the Clearinghouse needs its own electronic consent from the driver. If the driver refuses either one, the rule is blunt: that driver cannot operate a CMV for you.

3. Run the Clearinghouse full query. This has to be done before the driver performs any safety-sensitive function, including the road test if it is on a public road in a CMV. The FMCSA Drug and Alcohol Clearinghouse is where the query and the driver consent both happen.

4. Send the employer requests the same day. Each request should name the driver, include the signed release, list what you need and give a clear return address, fax number or email. The rule requires that the request tell the previous employer where to send the information. Letter, fax and email all work, provided the method reasonably protects confidentiality.

5. Log every attempt. For each previous employer, keep a written record of the employer's name and address, the date you contacted them or tried to, and what you received. "Called, no answer" on a sticky note does not count. A one-line entry with a date and a phone number does.

6. Follow up before the deadline, not after. A sensible rhythm is a second attempt about ten days in, through a different channel, and a third around day twenty. Look up the employer's current contact details independently; a phone number on a three-year-old application is often wrong.

7. File by day 30. Replies and documentation of good-faith efforts go into the driver investigation history file within 30 days of the start date. If the driver had no DOT-regulated employment in the past three years, file a note saying that no investigation was possible, within the same 30 days.

When the old employer does not answer

Most delays have ordinary causes. The safety manager left, the carrier changed names, the company closed, or the request went to a terminal that does not handle records. Previous employers are legally required to respond within 30 days, but that obligation does not help you if the company no longer exists.

What protects you is the paper trail. The regulation asks you to document failures to contact an employer and failures of employers to respond. It also says carriers should report non-responding previous employers to FMCSA under §386.12 and keep copies of those reports in the investigation file. Filing that report is a short step, and it is the clearest evidence that you made a good-faith effort.

A practical example of a complete record for one non-responsive employer:

The specific days are an example, not a rule. What matters is that each attempt is dated, the channels differ, and the file shows you kept trying inside the 30 days.

The driver's side of the file

Drivers often do not know they can see what a previous employer said about them. Your written notice tells them, and the rights are real:

• A driver may ask in writing to review the information, at any point from the application until 30 days after being hired or told they were not hired.
• You have five business days to provide it, counted from the request or from the day the records reach you, whichever is later.
• If the driver does not pick up the records within 30 days of their being made available, you may treat the request as waived.
• Corrections and rebuttals go to the previous employer, not to you. The previous employer has 15 days to correct or refuse, and five business days to forward a rebuttal to you.

The time a driver spends reviewing or rebutting does not extend your 30-day investigation deadline, and it does not shorten it either. The two run separately.

Who may see the file

The information you receive can be used for one purpose: deciding whether to hire the driver. Keep it away from anyone not involved in that decision. You may share accident information with your insurer, but never drug and alcohol information.

This is why the driver investigation history file is separate from the driver qualification file. The DQ file gets passed around for audits, dispatch questions and insurance renewals. The investigation file should sit in a locked drawer or a restricted folder with a short access list.

The rule also gives carriers and previous employers a degree of legal protection. No defamation, invasion of privacy or interference-with-contract claim may be brought over information furnished or used under §391.23, with two exceptions: someone who knowingly provides false information, and someone who did not follow the required procedures. That protection is one more reason to follow the procedure exactly.

Answering requests from other carriers

Every fleet is also somebody's previous employer. When a request comes in about a driver who left:

1. Answer within 30 days of receiving it, even if the answer is "no accidents to report."
2. Include the driver's identification and dates of employment in every reply.
3. Report accidents that meet the §390.15(b)(1) definition for the three years before the driver's new application. Minor accidents you chose to keep records of may be included.
4. Keep a record of the request and your response for one year: the date, who you sent it to and a summary of what you sent.
5. Give a contact point for corrections and rebuttals, and calendar the 15-day and five-business-day response windows when one arrives.

A fleet that answers promptly tends to get prompt answers back. It is also the simplest way to avoid becoming the name on someone else's §386.12 report.

A short pre-audit checklist

For each driver hired in the past year, an auditor will expect to find:

• An application listing three years of employers, plus the seven-year CMV employer list for CDL drivers.
• A signed notice of the driver's review, correction and rebuttal rights, dated before the hire decision.
• Driver consent for the Clearinghouse and for any Part 40 requests.
• A Clearinghouse full query dated before the first safety-sensitive function.
• A per-employer contact log with names, addresses, dates and results.
• Replies, or documented good-faith efforts, filed within 30 days of the start date.
• Copies of any §386.12 non-response reports.
• MVRs from each licensing state in the DQ file within 30 days.

If any of these are missing, fix the process first and the paperwork second. A backfilled log with dates that do not match the fax history raises more questions than an honest gap.

Frequently asked questions

Can a new driver start before all previous employers have replied?

Yes, as long as the pre-employment Clearinghouse full query is done before any safety-sensitive work. The replies, or proof of good-faith efforts, have to be in the investigation file within 30 days of the start date. For drug and alcohol information from employers in other DOT modes, Part 40 says the driver may not keep performing safety-sensitive work past 30 days unless the information was obtained or a good-faith effort was documented.

How far back does the previous-employer investigation go?

Three years before the application for the §391.23 investigation. The CDL application itself asks for an additional seven years of commercial driving employers, but that is a disclosure on the application, not part of the investigation.

Does a clean Clearinghouse query cover the previous-employer check?

Only the drug and alcohol piece, and only for FMCSA-regulated employers. You still need accident history and employment verification directly from each previous employer, and drug and alcohol information from employers in other DOT modes.

What if a previous employer has gone out of business?

Document every attempt to reach it, including searches for a successor company, and file the record within 30 days. If there is simply no one to contact, the written record of your attempts is your good-faith documentation.

Can we share what a previous employer told us with our insurance company?

Accident and employment information, yes. Drug and alcohol information, no. The regulation bars passing that part to an insurer.

What happens if the driver disputes what an old employer reported?

The driver sends a correction request or a rebuttal to that previous employer. The employer has 15 days to correct or refuse a correction and five business days to forward a rebuttal, which then becomes part of the driver's record for future inquiries.