---
title: Driver investigation history file
description: The secured file for prior-employer safety performance history and alcohol or drug consent.
date: 2026-10-20
lastReviewed: 2026-10-23
canonical: /glossary/driver-investigation-history-file
---
The **driver investigation history file** holds safety performance history investigations, consent forms, and employer replies separate from the qualification file ([49 CFR 391.53](https://www.ecfr.gov/current/title-49/section-391.53)). Access is limited to people involved in hiring decisions.