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calibration Tag

Yet More Problems with Breathalyzers: Latest Updates

Yet More Problems with Breathalyzers: Latest Updates

Yet more problems with breathalyzers have emerged in recent news reports from Massachusetts. The stories reveal two different, but sadly common, issues facing defense lawyers and their clients with DUI charges. Improper Calibration of Breathalyzers First, improper calibration of breathalyzers dating all the way back to 2011 was discovered by a group of defense lawyers starting back in 2015. The lawyers learned that the specific model of breathalyzer used by the police was not calibrated to the proper range, affecting the expected margin of error for the devices. This range is narrower than in other states, and the police had not...

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Revealing the Flaws in Breathalyzer Testing Procedures in Court

Revealing the Flaws in Breathalyzer Testing Procedures in Court

As DUI defense attorneys know, drivers may have excellent arguments that breathalyzer testing results should be excluded from consideration in court. Flaws in administering and interpreting breath tests abound. Which Kinds of Flaws in Breath Testing Can Be Shown in Court? The list of potential flaws in breath testing for DUI is long: Incorrect directions were given to a driver who takes a breathalyzer; Miscalibrated breathalyzer device used; Broken or old breathalyzer device used; Maintenance procedures for the breathalyzer were not followed; The specific model of breathalyzer has a fatal design flaw; Law enforcement broke the chain of custody for the results; ...

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Breathalyzer Technology: Still Unreliable?

Breathalyzer Technology: Still Unreliable?

Doubts about breathalyzer accuracy continue to circulate in the DUI defense community and have led to successful court strategies for defendants. There are two main ways that defense attorneys challenge breathalyzer results: by questioning calibration and maintenance procedures and rules, and by questioning whether the machines, even properly calibrated, produce accurate results. Courts have repeatedly found problems with the way police departments maintain breathalyzers and with the rules governing calibration and maintenance. See our previous blogs on this topic. Further, courts continue to order manufacturers to release source code for breathalyzer devices to defense attorneys. A recent case from Washington state...

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Problems with Breath Testing in Oklahoma

Problems with Breath Testing in Oklahoma

Breath testing for blood alcohol content has many flaws that could affect the outcome of a DUI case. Oklahoma law enforcement use a breathalyzer called the Intoxilyzer 8000, which works on a light absorption theory. Like for blood testing, variances in the test equipment and testing process can result in incorrect BAC level measurements. Breathalyzer technology employs a number of scientific assumptions that can be challenged because not every human processes alcohol or breathes into the device in the same way. For example, the devices’ accuracy depends on the assumption that every driver has an exact number of parts of alcohol...

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Devices Used for Breath Tests: Are They Accurate?

Devices Used for Breath Tests: Are They Accurate?

Oklahoma law enforcement officers administer breath tests to suspected drunk drivers, but the accuracy of those tests has been questioned repeatedly. Determining whether breath tests are accurate requires an understanding of what device is used, how it works, how it is maintained, and how tests are administered. The breathalyzer used in Oklahoma is called the Intoxilyzer 8000, an older model in use for over 10 years in the state. Breathalyzers like the 8000 work on a light absorption theory. You breathe into the end of the device and your breath is captured in a chamber. A light bulb that emits infrared...

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