Previous-employer safety performance history
How motor carriers investigate DOT-regulated employment under 49 CFR 391.23 and what belongs in the driver investigation history file.
- Published
- Published 2026-10-20
- Reading time
- 5 min read
Motor carriers must investigate each new driver’s safety performance history with DOT-regulated employers during the preceding three years, separate from the qualification file itself (49 CFR 391.23(a)(2), 391.53).
Short answer
Contact previous DOT-regulated employers (or use the Drug & Alcohol Clearinghouse for FMCSA-regulated history where the rule requires it), file each reply or your documented good-faith efforts within 30 days of the start date in a secure investigation history file, and keep alcohol and drug consent on file before the driver operates a CMV. Replies stay confidential to hiring decision-makers. DQid can store supporting documents; access and hiring decisions remain the carrier’s responsibility.
What to investigate
Accident history
49 CFR 391.23(d)At minimum, ask prior employers about accidents involving the driver during the three years before the application, using the data elements in § 390.15.
Alcohol and controlled substances history
49 CFR 391.23(e)From each previous DOT employer in a safety-sensitive function, investigate violations, failed rehabilitation, and post-referral testing issues listed in paragraph (e). FMCSA-regulated employers after January 6, 2023 use the Clearinghouse for much of this history.
Driver consent
49 CFR 391.23(f)Obtain consent that meets Part 40 rules before seeking alcohol and drug history. If the driver refuses consent for a Clearinghouse query, you must not permit the driver to operate a CMV.
Document each contact
49 CFR 391.23(c)(2)Keep a written record of each previous employer contacted, the date, and what you received—or document failures to contact or to obtain data.
No DOT employers in three years
49 CFR 391.23(c)(4)When no DOT-regulated employer existed in that period, document that no investigation was possible within the same 30-day window.
Where the records live
Replies and consent forms belong in the driver investigation history file, not in the open qualification file (49 CFR 391.53). Limit access to people involved in the hiring decision.
Driver review rights
Give the due-process notice before any hiring decision (49 CFR 391.23(i)). Drivers may request copies of investigative information, seek corrections from prior employers, or attach a rebuttal.
Use investigation data only for hiring decisions, and protect it from wider disclosure as the rule requires.
Sources
- 49 CFR 391.23 — Investigation and inquiries (eCFR text reviewed 2026-10-20)
- 49 CFR 391.53 — Driver investigation history file (eCFR text reviewed 2026-10-20)
- 49 CFR 382.701 — Drug and Alcohol Clearinghouse (eCFR text reviewed 2026-10-20)
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