Sorry if this isn't the right forum to put this in, I glanced at the others and couldn't find anything that said 'YOUR QUESTION GOES HERE'.

I've got a small argument going on with a fellow player, and we can't seem to find any resolution on the issue.

We know that Jim had a fair guiding hand in making the game, but neither of us are sure...

So, simply, is the DFRPG officially canon as compared to the books? Has there been WoJ on how the mechanics and such compare to book-canon? He's trying to justify an action based on something he read in the books, but to me it seems like the two aren't exactly the same (though both are still awesome!).