A positive drug test confirms that you are coming to work in a drugged state that places my company at risk of ruinous liability in the event of an accident. More importantly, much more importantly, it confirms that you are a criminal. People who whine about drug testing somehow overlook that using marijuana is a crime. Pot smokers, by definition, are criminals. At my company, and I suspect most places run by responsible people, one positive drug test results in immediate termination, regardless of previous on-the-job performance. We do not want criminals in our midst.