You are in danger, your business is in danger, and the rest of your employees are in danger. Meth causes unspeakable evil. Consider this event a small predictor of what's to come. You ain't seen nothing yet. But be aware that there are protections for addicts in many states. Tread carefully or you may wind up paying a hefty rehab bill/ being sued for discrimination against someone with a disease. Speaking to an attorney may be wise. Good luck.