What is one category of DOT alcohol testing?

Return-to-duty alcohol testing is a critical category of DOT alcohol testing designed for individuals who have previously violated alcohol regulations. This testing occurs to ensure that the individual has successfully completed the necessary rehabilitation program and is fit to return to their safety-sensitive duties. The process includes a required negative test result before the person is cleared to resume their responsibilities, emphasizing the importance of maintaining safety within transportation sectors.

The other options all relate to different contexts or functions that do not specifically pertain to DOT alcohol testing. For instance, routine health assessments and annual performance evaluations are focused on general employee wellness and job performance, while social gathering monitoring does not have any established relevance or authority within DOT regulations concerning alcohol testing.