While lab-based DOT urine tests are still the requirement, more trucking companies are electing to perform a hair drug test in addition to the urine test. In a profession where the consequences of impaired driving can be catastrophic, carriers depend on testing to help ensure that drivers are drug-free. Hair testing helps in this regard as it tends to provide a greater number of positive results when compared to urine because of its longer detection window and a tendency to be difficult to tamper or adulterate.
Read more about this trend towards hair testing in the trucking industry in this article from Overdrive.
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