It is critical that claims administrators and treating physicians obtain an accurate history of illegal substance use and abuse from an injured worker. This history is important when there is a physical injury for purposes of appropriately prescribing an opioid pain medication. This history is important when there is a psychiatric injury in order to determine causation and apportionment. With regard to physical injuries, the DWC is currently in the process of developing the Medical Treatment Utilization Schedule with a new 137 page Opioid Treatment Guideline.