Safety performance history inquiry turns 20
The safety performance history (SPH) final rule was published 20 years ago this month and went into effect the following October.
The SPH regulation (391.23) changed the casual nature of previous employer checks. The inquiry now applied to just former DOT-regulated employers within the immediate three years and specified what questions to pose these employers. The background check consisted of an employment verification and an inquiry into DOT accidents and DOT drug and alcohol history. This format remained unchanged for decades.
Changes in 2023
The SPH inquiry was revised January 6, 2023, when the questions relating to Part 382 drug and alcohol violations were removed. The testing history is now satisfied through a query of the Drug and Alcohol Clearinghouse.
But the SPH inquiry itself was not eliminated — contrary to some myths circulating through the transportation industry. New employers must continue to contact previous DOT-regulated employers and ask for the two remaining pieces of information: the employment verification and DOT crashes.
Resources
To learn more about the safety performance history request, check out the following Compliance Network resources:
- Compliance Institute topic, Safety performance history
Questions?
If you have a question on the safety performance history requirements or any other regulatory topic, we encourage you to reach out to our compliance experts using Expert Help. We're always happy to assist.

















































