So what is the science behind endogenous addictions?  (I'm a social worker too, and biochemistry is kicking my social work brain's ass!

Wow, how many Social Worker's read The Dresden Files!? I'm a Social Worker too, and for my two cents on this topic, I'm going to apply the logic that I always tend to apply when fantasy stuffs don't match up with scientific facts. We don't have accurate research on how Magic works. I'm not trying to be cocky or anything, but seriously, the fact that it's a magic potion could mean something along the lines that, while violently addictive, ThreeEye could have very abrupt withdrawals. It's made of magic 'stuff' so who's to say how it interacts with silly things like neurological pathways? Maybe after a while, the desire just 'goes away.' Or maybe its a plot point that's coming back around. "Something, something black council, something, magical connection of subconscious addiction, something something, mind slave army, something, own'd."

THis could be Intimidation or Presence, depending on how you look at it

"Predators respond to body language. I walked like I was on my way to rip someone's face off."

Dead Beat Ch.7

Investigation

"They might have been Heaven-on-wheels when it came to taking on bad guys in a fight, but they weren't investigators. They couldn't run these thieves down the way i could"

Death Masks Ch. 9