We are reviewing our employee health and occupational testing policies for medication discrepancy or diversion investigations (e.g., dropped controlled substances, unresolved medication count variances).  In these situations, does your organization utilize targeted drug testing panels that exclude THC/marijuana, focusing instead on relevant controlled substances associated with the discrepancy?  If so, are these panels standard or ordered case-by-case?  The reason I am asking, is because marijuana is legal in Oregon, and if the employee would test positive for marijuana when we're really concerned about the results for the missing substance, it could be problematic.