The most important case in New Jersey DWI history is State v. Chun, decided in 2008, which set the standards for DWI defense and prosecution for breath testing cases statewide. Despite significant evidence to the contrary, the New Jersey Supreme Court in Chun determined that the new Draeger Alcotest 7110 MKIII-C breath testing machine was scientifically reliable.
In Chun, the reliability of the machine was based on the safeguards of the testing procedure, one of which was an apparatus known as an Ertco-Hart Digital Thermometer. This thermometer insures that the temperature of the various simulator solutions used for calibration of the Alcotest during the control and linearity testing are at the required 34.0 degrees Celsius, with a tolerance of plus or minus 0.2 degrees.
These Ertco-Hart digital thermometers were calibrated by Draeger, which also supplied a NIST (National Institute of Standards and Technology) Certificate of Traceability with each calibration. Draeger, however, decided it would no longer produce the certificates of calibration, and the Ertco-Hart digital thermometer used by the State is no longer manufactured. As a result, the required calibration had to be done with a different digital thermometer.