U.S. Attorney’s Offices (“USAOs”) across the country are issuing warning letters to physicians and other prescribers (collectively, “Prescribers”) cautioning them about their opioid prescribing practices (the “Warning Letters”). In just the last week, the USAO for the Eastern District of Wisconsin sent warning letters to over 180 prescribers identified by Drug Enforcement Administration (“DEA”) data as prescribing opioids at relatively high levels. The Food and Drug Administration and the Federal Trade Commission have also been…