"Interrogation expert" Says the guy who, counting from the list: Ran a man through with a rhino's horn, fed one to piranhas, split a man in half with a windowsill, hung a man off the top of a skyscraper... the list goes on.
Don't forget that time he opened a guy's guts in the middle of the forest, hanged them from branches and when the guy woke up Frank said: "Let's talk". I believe that is Interrogation 101 right from the Geneva Convention.
Because he seems like the dude who doesnt have time to give a damn about shaving lol. He looks like he should have grease on his hands from constant gun and auto detail. Or he just looks like he belongs on sons of anarchy