When I applied for my life insurance policy a nurse came to my house and took a blood sample that was tested for marijuana, cocaine and nicotine. They wanted to make sure I wasn't lying on my application when I said I was a nonsmoker.
So it's good enough for private companies to drug test their people to make sure they are protecting their investment. I don't see a problem with government doing the same.
If these people were applying for a govt JOB they’d be drug tested.