JJ Keller Entry Level Driver Training for CDL (Commercial Driver’s License) Practice Test 2026 - Free CDL Practice Questions and Study Guide

A driver is required to take a drug test based on reasonable suspicion if a supervisor observes behavior or circumstances that indicate the driver may be under the influence of drugs or alcohol. Reasonable suspicion can arise from various factors, such as erratic driving, noticeable impairment, or specific information suggesting drug use.

This requirement is in place to ensure safety on the roads, as the performance of a driver under the influence can pose significant risks to themselves and others. The training emphasizes that supervisors must be properly trained to identify behaviors that warrant such a test, and their observations must be documented to support the decision.

While other scenarios like driving for extended hours or having a minor traffic violation may suggest fatigue or lesser issues, they do not automatically mandate a drug test unless there are additional, specific concerns regarding substance use. Additionally, pre-employment testing happens prior to starting a job, but is not a response to a current behavioral observation or event like reasonable suspicion would be.