A: Although THC is legal in many states now, the decision to allow it or not in a workplace is up to the employer who has ordered your drug screen. In States such as Washington and Oregon—the drugs that are included in employers’ workplace testing policies are determined by the employers, not by the State or the government. If you are an employee covered by Department of Transportation (DOT) regulations, the DOT does not currently recognize THC as an uncontrolled substance and therefore it is not allowed, regardless of what State you live in, or what your reasons are for using it. If you use THC, It is best to ask your potential employer about their drug testing policy regarding THC before you apply for the job so that you know what to expect.