More than 20,000 DWI cases are being called into question after it was revealed that a New Jersey State Police sergeant mis-calibrated breathalyzers.

Sgt. Marc Dennis, a coordinator in the State Police Alcohol Drug Testing Unit, was charged in September for deliberately skipping a required step in recalibrating Alcotest devices, which are used in DWI cases.

Dennis is accused of falsely certifying that he performed temperature checks when recalibrating the Alcotest devices. Elie Honig, director of the criminal justice division, said the step is not scientifically necessary but is required under a procedure developed by the State Police's chief forensic scientist.

Man blowing into breathalyzer
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Dennis was only accused of tampering with three devices, but it has not been made clear when and where those devices were used, which calls into question over 20,000 cases.

Earlier this year, a State Police lab technician was accused of falsifying marijuana tests, affecting almost 15,000 cases.

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