DWI Attorney Nassau County: The Law Office of David Galison, PC The Intoxalock device works by requiring a breath sample prior to starting a vehicle and periodically as the vehicle is being driven. If the breath sample provided contain an alcohol level below the acceptable threshold, the vehicle will be allowed to operate. Under no circumstances will the device shut the vehicle off when it is being driven. The Intoxalock utilizes state-of-the-art fuel cell technology allowing for the highest level of accuracy and precision. It has been certified by an independent laboratory to meet or exceed all National Highway Transportation Safety Administration (NHTSA) standards.

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