The Minnesota Bureau of Criminal Apprehension says that 276 DWI breath tests that were potentially impacted by data entry errors were accurate after all.

The department ordered police departments across the state to test all DataMaster (DMT) devices after "multiple data entry errors" were discovered relating to the installation of dry gas cylinders into the instruments.

These gas cylinders have unique identifiers and each contains a known alcohol concentration that is used as a control when taking breath sample from drivers.

In an update on Friday, the BCA said that DMT instrument operators had entered "incorrect alcohol concentration values from replacement dry gas cylinders," which meant the devices may have given incorrect readings on breath tests, potentially putting some drivers ov

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