Common standardized tests include walk-and-turn, one-leg stand, and horizontal gaze nystagmus, which assess balance, coordination, and eye movements. Officers may also use nonstandard observations, such as counting steps or checking for stumbling. Each test is intended to provide indicators of impairment, but their administration and interpretation vary. In Tchula, as elsewhere, courts evaluate the context and totality of observations rather than relying on any single test result. That makes a careful review of how each test was performed essential for any challenge. If footage is available, it often shows whether the officer followed the proper instructions and whether environmental or personal factors affected performance. Documenting these details helps assess the strength of the prosecution’s case and determine whether a motion to exclude unreliable results is appropriate.