What changes were made to the SFST procedures in recent updates?

The correct choice highlights that adjustments to instructions or scoring methods have been made based on ongoing research findings. This reflects the dynamic nature of the Standardized Field Sobriety Test (SFST) program, which evolves in response to scientific studies aimed at enhancing accuracy and reliability in assessing impairment.

Ongoing research provides insights into how subjects respond to the tests, leading to modifications that improve clarity in the instructions given to individuals being tested. For example, small changes in how tests are administered or scored can significantly impact the standardization of results across different conditions, which is critical for legal and enforcement purposes.

These updates help ensure that law enforcement officers are utilizing the most effective methods available, thereby increasing the validity of the results obtained from SFSTs. By continuously integrating research findings, the SFST program maintains its relevance and effectiveness in the field of impaired driving assessment.