Below is a link to information found at thesmokinggun.com in regard to a man who managed to become naturalized as well as infiltrate US interests and receive a high level security clearance with use of fraudulent information including name, origin, date of birth, etc.  Although, nothing can be found in the report which states the man was subjected to a polygraph exam, he was subjected to a DOD background check which likely included a polygraph exam.

link:
http://www.thesmokinggun.com/archive/1017051malki1.html

George,

Thank you for the insight.  I am not familiar with the SF86 as I have never seen it.  I figure the governmental reliance on polygraph screening would surely apply to translators trusted with sensitive classified information thusly resulting in a full scope test, however I realize my assumption is conjecture as this is not mentioned in the linked report.  It would seem his background check, possibly including polygraph screening, was a complete failure.