There are MANY Iranian born Jews in Los Angeles and New York who are now citizens that be trusted with such matters of translating without treason or deceit.
There are also a handful of Iranian Christians that are converts from Islam who could do an even better job.
For some reason, the govt used to resist hiring Jewish or Israeli-born Arabic or Farsi translators, even though they would be excellent and a lot more trustworthy than the Muslims. I don't know if this is still policy, but it was at one time.