What can trigger a random drug screening for CMV drivers?

The correct answer is indeed linked to FMCSA regulations or employer policies necessitating random testing. Random drug screenings for Commercial Motor Vehicle (CMV) drivers are primarily mandated by the Federal Motor Carrier Safety Administration (FMCSA) to ensure safety and compliance with federal regulations. These regulations require that employers establish a drug testing program that includes a random testing component, where drivers can be randomly selected for drug tests without prior notice. This is crucial for maintaining safety in the transportation industry, as it helps deter substance abuse among drivers who operate large vehicles that can be hazardous if operated under the influence of drugs or alcohol.

The other options do not align with the established protocols for triggering random drug screenings. Requests for personal health checks or self-reporting of substance use are not reliable criteria for mandatory testing; the safety protocols rely on systematic and random processes to maintain objectivity and integrity in testing. Similarly, completing a long driving stint does not trigger a random drug screening as the randomization is purposefully designed to occur independently of specific driving conditions or performance.