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Breath alcohol testing is the forensic discipline in which the alcohol concentration of an individual is determined by examining a breath sample. Breath testing is a non-invasive method to accurately determine an individual’s alcohol concentration.
The Michigan State Police (MSP) is legislatively mandated to manage the fleet of breath alcohol instruments which are installed in county jails and other locations around the State. MSP's Forensic Science Division (FSD) regularly inspects field instruments to ensure they are operating correctly, provides the necessary oversight to the program, and keeps the associated records needed to meet the legal requirements that assist in the investigation of alcohol related driving cases.
To accomplish these goals Michigan uses the Intoxilyzer 9000, manufactured by CMI Inc. This instrument is widely used in the United States. Its performance was validated independently by MSP in 2023 prior to being adopted for use.
Law Enforcement officers in Michigan must be certified to operate the Intoxilyzer 9000. This certification involves online and in person training, as well as a written examination. Additionally, they must re-certify every two years to ensure they remain current with accepted practices within the field of breath alcohol.
The MSP website offers the ability for our stakeholders to access relevant data from any Intoxilyzer 9000. By entering the instrument serial number, one can review subject tests conducted using that instrument. This data redacts PII (Personal Identifiable Information) yet still provides results associated with each evidential breath test.