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.
Remember the Coptic family that was murdered in Jersey City, NJ?
Their cousin was the translator for the Lynne Stewart (Sheik Rahman's lawyer) trial.
Murder happened during the trial.