It’s hard to overstate how good Cristina Arguedas was last week during opening arguments in defense of FedEx Corp.

Going into trial last week in U.S. District Judge Charles Breyer’s San Francisco courtroom, FedEx faced charges that it conspired with illegal online pharmacies to ship drugs based on bogus prescriptions. But during the course of Arguedas’ three-hour presentation to Breyer on June 13, the company came across more as a long-term government cooperator than a conspirator in an illicit drug distribution ring.