Simply, drug testing is good. The Iowa Legislature's effort to change the current law shows concern for safety. And safety is a key issue here. Think about the safety of the company, its workers and the people the company serves. Although drug use is pretty much a stupid thing to begin with, drug use in certain jobs is particularly dangerous.
Construction workers have one of the highest rates of drug use among jobs.
Without a doubt, this is one occupation that should have strict testing. In addition, the employee's work may put others, including co-workers and the general public in danger. Think of the assembly line at your favorite car manufacturer. You want to make a big purchase, like a car or a house. Someday, most of us will have children.