Which of the following is not considered a validated field sobriety test?

The Modified Romberg Balance test is not considered a validated field sobriety test in the same way as the other options listed. Validated field sobriety tests are those that have undergone rigorous scientific evaluation and have been found to effectively indicate a person’s level of impairment due to alcohol or drugs.

The Walk-and-Turn test and the One-Leg Stand test are part of the standardized field sobriety tests developed by the National Highway Traffic Safety Administration (NHTSA) and are widely accepted as reliable indicators of impairment. These tests assess an individual’s ability to perform tasks that require coordination, balance, and attention, which are typically affected when a person is under the influence.

Nystagmus testing is also a validated method used to assess impairment. It involves observing the eyes for involuntary movements, particularly when looking to the side, which can indicate alcohol impairment because it affects ocular muscle control.

While the Modified Romberg Balance can provide useful information in determining a person's impairment, it has not been validated through the same level of scientific scrutiny as the other tests and, therefore, is not considered a standard field sobriety test in law enforcement practices.