But yet, you test the employee for something they did OFF hours and DAYS ago.. but become presumptuous and judgmental.  I have never been high on the job in 30+ years, but I smoke a bowl every night and would fail your test. Even though I am most likely your best worker and would never even know I smoked at night.  It's NOYDB what I do in my off hours since it doesn't impact the job.  Way to believe in Reefer Madness.