Forensic toxicologists and forensic chemists are common experts for challenging the accuracy and reliability of breathalyzer tests. Sometimes an engineer should be consulted for providing analysis and testimony about the breathalyzer, including testing the breathalyzer with such equipment as an oscilloscope.

One engineer who does such work is Thomas E. Workman, Jr. His related article is “Massachusetts Breath Testing for Alcohol: A Computer Science Perspective.” 8 J. High Tech. L. 209 (2008).