49 CFR § 391.23
Investigation and inquiries
See your compliance status for this section
3-minute free audit. CFR-cited gap report. No signup.
What does 49 CFR § 391.23 require?
49 CFR 391.23 requires the carrier to independently verify what the applicant disclosed on the 49 CFR 391.21 application. Three required investigations: (1) MVR pull for each state where the applicant held a license in the preceding 3 years, (2) contact with each prior employer in the preceding 3 years to verify employment dates and CMV-driving safety performance, and (3) FMCSA Clearinghouse pre-employment full query. The investigations must be completed BEFORE the driver performs any safety-sensitive function. Findings are retained in the DQF. Missing investigations are one of the most common audit findings — auditors routinely check whether the carrier documented prior-employer verification.
Regulation text (summary)
Each motor carrier shall make the following investigations and inquiries with respect to each applicant: (a) the applicant's driving record for the preceding 3 years from each state where the applicant held a license during that period — the carrier obtains the MVR directly from each state DMV; (b) the applicant's employment record for the preceding 3 years, including verification of prior CMV driving employment and inquiry into the applicant's safety performance — the carrier must contact each prior employer and document the inquiry; (c) FMCSA Drug & Alcohol Clearinghouse pre-employment full query per 49 CFR 382.701 (effective January 6, 2023). All inquiries must be documented and retained in the DQF.
Read full regulation at eCFR.govWho must comply with 49 CFR § 391.23?
Every motor carrier hiring CMV drivers. The investigation requirements apply equally to employee drivers, leased owner-operators, and drivers from driver-leasing services. The carrier cannot delegate the investigations away — even when using a driver-staffing service, the carrier dispatching the driver is responsible for 49 CFR 391.23 documentation. The Clearinghouse query (49 CFR 382.701) requires the applicant's written consent before the query can be run.
What happens if you violate 49 CFR § 391.23?
Civil monetary penalties: $1,100 to $16,550 per violation per driver. Common citations: no MVR on file at hire, no documented prior-employer inquiry, missing Clearinghouse pre-employment query (this has become the most-cited new violation since the 2023 effective date), Clearinghouse query run after driver started safety-sensitive work. Investigations are a Compliance Review high-frequency finding — auditors check the DQF for documented evidence of each required inquiry.
Penalty range
Annual citations
YoY penalty trend
How to comply (implementation checklist)
- 1Pull MVR from each state where the applicant held a license in the prior 3 years, before any safety-sensitive function.
- 2Contact each prior employer in the preceding 3 years and document the inquiry (date, contact person, response).
- 3For applicants with prior CMV-driving experience, verify safety performance with each prior employer.
- 4Obtain applicant's written consent for FMCSA Clearinghouse query (49 CFR 382.703).
- 5Run FMCSA Clearinghouse pre-employment full query per 49 CFR 382.701.
- 6Document any Clearinghouse 'prohibited' status or unresolved violation findings.
- 7Wait for all required investigation results before allowing safety-sensitive work.
- 8Retain investigation records in the DQF (per 49 CFR 391.51) and Clearinghouse query records (per 49 CFR 382.401) — keep separate.
- 9Cross-reference inquiry results against the applicant's 49 CFR 391.21 application for inconsistencies.
- 10Audit the inquiry workflow quarterly to ensure no driver is dispatched before all required investigations are complete.
Common misinterpretations
- Misinterpretation: 'I asked the driver about prior employers and that's enough.' Reality: 49 CFR 391.23 requires INDEPENDENT VERIFICATION — pulling MVRs from state DMVs (not relying on what the driver said), contacting prior employers directly (not relying on driver-provided contact info without verifying), and querying the FMCSA Clearinghouse for federal drug/alcohol records. Self-disclosure on the application (49 CFR 391.21) is the starting point; verification is the requirement.
- Misinterpretation: 'The MVR I have from last year is fine.' Reality: 49 CFR 391.23(a) requires the MVR be pulled at HIRE — not relying on the prior carrier's MVR or an MVR more than ~30 days old. The annual review under 49 CFR 391.25 is a separate requirement on top of the hire-date MVR.
- Misinterpretation: 'Prior employers won't talk to me anyway.' Reality: The carrier must DOCUMENT the inquiry, even if the prior employer doesn't respond. A signed statement that the carrier contacted X employer on Y date and received Z response (or no response) satisfies the documentation requirement. Failure to ATTEMPT the inquiry is the violation — not failure of the prior employer to cooperate.
- Misinterpretation: 'The FMCSA Clearinghouse query is optional.' Reality: Since January 6, 2023, 49 CFR 382.701 has made the pre-employment full query MANDATORY for every CDL driver. The query must be completed BEFORE safety-sensitive work begins. Skipping or delaying the query is a violation citable under both 391.23 and 382.701.
Real enforcement examples
Anonymized from public FMCSA enforcement summaries. Penalty amounts reflect assessed and final settled values where disclosed.
Mid-size carrier received $58,250 penalty in 2024 after Compliance Review found 5 drivers had no documented prior-employer inquiry on file. The carrier had asked applicants for references but never independently contacted the prior employers. 5 violations × penalty assessment.
Source: FMCSA SafetyNet 2024 enforcement summary, anonymized
New-entrant carrier received $13,200 penalty in 2025 after a roadside inspection led to a follow-up audit revealing no Clearinghouse pre-employment query for the inspected driver. The driver had been dispatched 47 days before the carrier ran the query.
Source: FMCSA SafetyNet 2025 enforcement summary, anonymized
How FileFlo handles 49 CFR § 391.23
FileFlo's compliance rule-pack DQF-49CFR391.23 automatically checks every document you upload against this regulation. Auto-detects document type, parses key fields, sets renewal alerts, and surfaces this section in your audit binder if a gap is found.
Already evaluating? Start a 5-day free trial →
Frequently asked questions
What investigations are required under 49 CFR 391.23?▾
Three required investigations: (1) Motor Vehicle Record (MVR) pull from each state where the applicant held a license in the preceding 3 years, obtained directly from each state DMV; (2) prior-employer inquiry covering the preceding 3 years of employment, including verification of safety performance for any prior CMV-driving roles; (3) FMCSA Drug & Alcohol Clearinghouse pre-employment full query (49 CFR 382.701, effective January 6, 2023).
When must the investigations be completed?▾
Before the driver performs any safety-sensitive function. 'Safety-sensitive function' includes driving, loading, supervising loading, fueling, and similar activities under 49 CFR 382.107. The investigations must be in the DQF and the results reviewed before the carrier dispatches the driver.
What if a prior employer won't respond?▾
The carrier must DOCUMENT the inquiry attempt, even if no response is received. A signed statement noting the date, contact method, contact person, and lack of response satisfies the documentation requirement. The violation is failure to INQUIRE, not failure to receive a response. Carriers should attempt by phone + email + fax (where applicable) and document all attempts.
Do I need to pull MVRs from every state?▾
Yes — from every state where the applicant held a driver's license during the preceding 3 years. A driver who lived in 2 states during those 3 years needs MVRs from BOTH state DMVs. Most carriers use an MVR-pulling service that handles multi-state queries automatically.
What is the FMCSA Clearinghouse pre-employment query?▾
Effective January 6, 2023, 49 CFR 382.701 requires every motor carrier to run a 'full' query of the FMCSA Drug & Alcohol Clearinghouse before allowing a CDL applicant to perform safety-sensitive functions. The query checks for unresolved drug or alcohol program violations across all prior employers. The applicant must provide written consent. Carriers must also run annual full queries for current drivers and limited queries when adding new drivers.
Can I use a third-party service for these investigations?▾
Yes — most carriers use MVR pulling services and consortium/TPA services for Clearinghouse queries. The carrier remains legally responsible for the investigations being completed correctly and timely. Third-party services document the inquiries; the carrier retains those records in the DQF.
How does 49 CFR 391.23 differ from 49 CFR 391.25?▾
49 CFR 391.23 is the investigation at HIRE — MVR pull, prior employer inquiries, Clearinghouse pre-employment query. 49 CFR 391.25 is the ANNUAL inquiry — annual MVR pull and review of the driver's driving record. 391.23 establishes qualification at hire; 391.25 maintains it annually.
How long are the investigation records retained?▾
Investigation records are part of the DQF and retained 3 years after the driver's separation per 49 CFR 391.51(d). Clearinghouse query records are retained in a separate confidential file per 49 CFR 382.401 — minimum 5 years from the date of the query.
Related regulations
Related guides
Sources + reviewer
Primary source: eCFR.gov: 49 CFR § 391.23
Reviewed by Chad Griffith (Founder + CEO, FileFlo) on