What behavior could indicate an officer should terminate an SFST?

In the context of conducting a Standardized Field Sobriety Test (SFST), the behavior that indicates an officer should terminate the test is when the subject exhibits uncontrollable movements. This can be interpreted as a sign of significant impairment or a potential medical issue that warrants immediate attention. Uncontrollable movements may hinder the integrity of the test, as they can prevent the subject from accurately demonstrating their physical capabilities. Additionally, such behavior could pose safety risks, not only to the individual being tested but also to the officer and others nearby. Therefore, when an officer observes this type of behavior, it is prudent to stop the test to ensure safety and properly assess the subject's condition.