The matter with the U.S. marshals occurred Aug. 29, when three agents served an arrest warrant on Nikparvarfard at his clinic at 5058 City Ave. in Philadelphia, according to an affidavit by DEA Agent Daniel Soeffing. When the federal agents approached the physician, Nikparvarfard claimed he was not the man they were looking for and presented a driver's license with the name Mehdi Armani. The marshals were not convinced.