Abstract
It is estimated that 2.0 percent of drivers with commercial driver's licenses (CDLs) in 2003 used controlled substances, and 0.2 percent used alcohol (0.04 BAC) while performing their duties. On the basis of these findings, the Federal Motor Carrier Safety Administration (FMCSA) required testing rates for CDL drivers in calendar year 2004 remain at 50 percent for controlled substances and 10 percent for alcohol. (Author/publisher)