Which of the following is a potential legal complication of field sobriety tests?

Errors in test administration can lead to significant legal complications regarding the validity and reliability of field sobriety tests. Proper administration of these tests is crucial because even minor deviations from standardized procedures can affect the outcomes. For instance, failing to instruct the subject correctly or not conducting the tests on a flat surface can result in inaccurate assessments of a person's sobriety.

When an officer doesn't adhere strictly to the guidelines established for field sobriety tests, it creates grounds for defense arguments challenging the legitimacy of the results. This can weaken the prosecution's case if the defense can demonstrate that errors in administration contributed to incorrect conclusions about a suspect's impairment.

In contrast, the presence of too many witnesses may not inherently complicate the legal proceedings. Lack of video evidence could impact the case but doesn't necessarily introduce complications in the legality of the test itself. Similarly, while dependency on visual observations is a concern, it is more about the limitations of subjective judgment rather than a legal complication stemming from test administration errors.