Certified evidential instruments should not ordinarily be used for which of the following?

Certified evidential instruments, such as the Intoxilyzer 9000, are designed specifically for use in legal and law enforcement contexts to measure blood alcohol content with reliability and accuracy. Their primary purpose is to provide evidence for criminal proceedings, such as DUI cases.

Using these instruments for public information programs could lead to misinterpretation of data or misuse of the technology. The results generated by such devices may not be suitable for general public dissemination unless in the appropriate context of law enforcement. Factors affecting accuracy, calibration, and environmental conditions that the instruments are subjected to in a research or informal setting may not align with the legal requirements for evidential use.

Consequently, while certified evidential instruments can yield valid measurements in controlled, formal environments, extending their use to public information could undermine their integrity and intended purpose, making this option the most fitting answer for the question at hand.