To cover the company's ass in case someone is injured on the job by an impaired person. Without drug testing, the injured party has a good case, saying managem

To cover the company's ass in case someone is injured on the job by an impaired person. Without drug testing, the injured party has a good case, saying management was asleep at the wheel. But with drug testing, management can say they did screen for drugs, no mutter how asleep they are.