In August 2017, Hawley announced that he had opened an investigation into seven opioid distributors (Allergan, Depomed, Insys, Mallinckrodt, Mylan, Pfizer, and Teva Pharmaceuticals). In October 2017, he expanded his investigation into three additional pharmaceutical companies (AmerisourceBergen, Cardinal Health, and McKesson Corporation), the three largest U.S. opioid distributors.
