The Minnesota Bureau of Criminal Apprehension says DWI breath tests administered with equipment that had data errors were accurate.

At least 447 cases across the state were put into question after the BCA discovered errors in September while installing gas cylinders in DataMaster instruments, which are breath testing machines.

"Since we first identified this issue, our BCA lab forensic scientists have now mathematically verified that all identified DWI evidentiary breath samples that were involved in these DMTs have been deemed to be accurate and reliable," Minnesota BCA Superintendent Drew Evans said in a news conference late Friday afternoon. "Our scientists are prepared to testify to that."

When a machine is first set up, law enforcement officers enter information from the cyli

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