This is how FBI officers find out truth.

Robert: you swear to God
Eric: excuse me !!
Robert: swear to god that everything you just told me is true
Robert: No .. I am not gonna do that , I wouldnt lie …

This is another conversation between two FBI agents.

Robert : You know why the Soviet Union empire collapsed?
Eric : …….????Good morning?
Robert : I made a carrier studying them, they were smarter than us – more devious, more determined why did they fail ?
Eric : ..?
Robert : Godlessness. Atheism

Both conversation are from Breach – a movie based on real story.