After Dave Conley died of lung cancer, his widow led for benefits under the Black Lung benefits Act. To qualify for benefits under the act, she had to show that exposure to coal dust was a substantial contributing factor to her husband's death. Conley had been a coal miner, but he had also been a longtime smoker. At the benefits hearing, a physician testified that coal dust was a substantial factor in Conley's death. No evidence was presented to support this conclusion, however. -e administrative law judge awarded benefits. On appeal, should a court defer to this decision? Discuss.