Contractors do drug tests already - by Jake Stump, Daily Mail, Charleston, WV
For example, a job site with 100 workers would see random screenings of about 25 crew members. Computer systems at drug-testing laboratories choose which workers must submit to the test based on a random drawing of Social Security numbers.
'If they refuse (to take the test), they are considered fired from the job,' Wade said.
Workers can be tested as many as four or five times a year, she said.
She also said the number of failed drug tests have significantly declined since the program began.
Construction and union officials said they're far ahead of the curve on administering drug tests compared to other industries, including state government.