Petition for Rulemaking; Notification of Petition for Rulemaking; Invalid Specimen Determinations
The comment period closed Nov 2, 2026.
This document announces receipt of a petition for rulemaking received by DOT on February 27, 2026, to initiate a rulemaking to amend 49 CFR part 40. The petitioner's proposed amendments seek to incorporate structured medical verification standards when an employee asserts a plausible medical explanation for abnormal specimen validity findings, including abnormal pH values. Specifically, the petiti
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Full history
- Oct 1, 2026
Rule published
Petition for Rulemaking; Notification of Petition for Rulemaking; Invalid Specimen Determinations
Transportation Department
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