(May 13, 2019, 1:51 PM EDT) -- CHANDLER, Ariz. — Opioid maker Insys Therapeutics Inc. on May 10 and 13 said in a press release and a regulatory filing that in the face of falling sales, litigation expenses, a federal drug settlement and a lack of liquid assets, it may be necessary for it to file a voluntary petition for reorganization under Chapter 11 of the U.S. Bankruptcy Code, 11 U.S. Code....