A fugitive doctor charged in the nation’s largest prosecution of Internet pharmacies is getting off in part because there’s just too much evidence: more than 400,000 documents and two terabytes of electronic data that federal authorities say is expensive to maintain.

Armando Angulo was indicted in 2007 in a multimillion dollar scheme that involved selling prescription drugs to patients who were never examined or even interviewed by a physician. A federal judge in Iowa dismissed the charge last week at the request of prosecutors, who want to throw out the many records collected over their nine-year investigation to free up space.