TN HB2439

Establishes requirements for law enforcement use of oral-fluid (saliva) screening tests in DUI investigations, including mandatory use of approved devices, officer certification, and documented quality-control checks before each use

Requires confirmatory laboratory testing (GC-MS or LC-MS/MS) from an ISO/IEC/17025 accredited lab before oral-fluid screening results can be used as substantive evidence in criminal proceedings or to support administrative license consequences

Mandates detailed documentation for each oral-fluid test including device information, calibration dates, chain-of-custody details, and officer credentials, with records retained for at least 3 years

Creates evidentiary consequences for noncompliance: failure to follow testing protocols renders results inadmissible; failure to preserve samples or provide required disclosures creates a rebuttable presumption of unreliability

Takes effect July 1, 2026 for rulemaking and training purposes, and January 1, 2027 for enforcement actions