Marijuana is by far the drug of choice among drivers testing positive for controlled substances, according to data compiled by the federal Drug and Alcohol Clearinghouse.
In the first detailed summary report of the clearinghouse, released on June 10 by the Federal Motor Carrier Safety Administration (FMCSA), data shows that the 10,388 driver drug tests that tested positive for marijuana accounted for almost half of the 21,156 total positive tests submitted to the clearinghouse as of June 1. The...
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