Employers across the country continue to do drug testing which tests for the five most commonly abused categories of drugs including marijuana. If an employee tests positive on a drug test, it is up to the employer to deal with the problem. The employer has the right to immediately fire the employee or to warn the employee that breaking the company's drug free policy will not be tolerated. In this case, the employee may be tested again at a later date. It is a second chance for the worker to…