In my previous Homeland post I neglected to mention that Inigo Montoya plays a major role in the show. His character is an older CIA agent who mentors Claire Danes' character. He does a great job masking his Spanish accent. It's well documented that Mark loves Inigo ... to w(h)it, here's a snapshot of one of Mark's tats:
*** SPOILER ALERT, SCROLL DOWN TO END OF SPOILER ALERT TO AVOID SPOILAGE
I now firmly believe that Brody is not a terrorist.
First, Brody is clearly willing to bang an infidel, so his inability to bang his wife probably stems from the fact that his wife is banging his best friend.
Second, Brody was a sniper so he can probably control his heart rate and that's why he passed the last question of the polygraph.
Third, Brody drank a bunch of beer and bourbon in different scenes which doesn't jibe well with a transformation into an Islamic fundamentalist.
Fourth, in the flashback where Brody beats Walker to death there's a gun to Brody's head, so he didn't kill him willfully.
All this confirms my suspicion that he wasn't turned.
I now firmly suspect that Inigo Montoya is the bad guy. Last episode, Inigo Montoya made it a point to straighten out the Persian rug in his office. This detail struck me as heavy-handed foreshadowing. Why else would they include it? Perhaps it's his prayer rug? (Although it's kind of insane for a terrorist to pray in his office within CIA headquarters.) He also said a prayer for the terrorist who killed himself. I don't know if it was in Hebrew or Arabic but it seems odd to a CIA agent to pray for a dead terrorist. And in the most recent episode it appeared that Inigo Montoya initially failed his polygraph test. He retook the test the next day, possibly after taking some special CIA agent drug that steadies your heart rate. AND, if you remember from an earlier episode, Inigo Montoya spent three months in an Iraqi prison staring down Uday Hussein. So he was a POW.
Thus I believe that Inigo Montoya is the POW who was turned, not Brody.
*** END OF SPOILER ALERT
What's the point of this post? To illustrate that Homeland is so well done that the main character's psychoses and paranoia made me paranoid, and that I've been sucked into the nuances of a TV show. This rarely happens. Watch Homeland, if for no other reason so that I can discuss it with someone else.