I'm a man of my word, so whatever you been hearing
Is the truth -- flatline, polygraph, that's me

from Talib Kweli (Ft. Big KRIT, Mela Machinko & Outasight) – Beautiful Lyrics on Rap Genius

Meaning

A flatline reading on a polygraph (lie detector) means that the subject is telling the truth — unless you’re a sociopath, of course

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