Tanks was a bus driver for the Greater Cleveland Rapid Transit Authority (GCRTA). The GCRTA had a substance abuse policy to protect public safety that required drivers to be tested after accidents. Tanks ran into a pole. As required, she submitted blood, saliva, and urine samples, which tested positive for cocaine. Under the terms of the policy, Tanks was fired. She sued, claiming that the drug test was an unreasonable search in violation of the Fourth Amendment to the Constitution. Did she have a case? [Tanks v. GCRTA, 930 F.2d 475, 6th Cir. (1991)]