Breathalyzer Error Impacts DWI Tests in Winona County
Winona County is dismissing 39 DWI charges due to an issue with a breath test machine at the county jail.
A cylinder was incorrectly installed in the DataMaster Transportable (DMT) breath test machine, which was discovered after the Minnesota Bureau of Criminal Apprehension (BCA) notified Winona County Sheriff Ron Ganrude of the error in September.
- The error involved a cylinder for a Preliminary Breath Test (PBT) being incorrectly installed in the DMT.
- PBTs are breathalyzers used by officers to establish probable cause for an arrest.
- DMTs are secondary tests that produce more accurate results.
The cylinder got changed starting in June of 2025.
Author's summary: Winona County dismisses 39 DWI charges due to breathalyzer error.
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