North Carolina RADAR State Practice Exam - Practice Test & Study Guide

The assumption made in the case of Royals v. Commonwealth regarding instrument readings is that readings taken during an interval are usually correct if the start and end readings are accurate. This reflects a common understanding in various fields, including legal and scientific contexts, that as long as the initial and final readings of an instrument are reliable, the readings in between are likely to be valid as well. This assumption stems from the idea that instruments operate within a consistent range and produce reliable data throughout their function, barring any evident malfunctions or discrepancies.

This premise is essential as it lends credence to the reliability of data collection methods and contributes to ensuring that evidence derived from such readings can be trusted in legal proceedings. Continuous monitoring of instrument performance is also vital, but if there is assurance at both the beginning and end of a measurement period, it is reasonable to maintain the accuracy of the readings taken during that span.