Have you ever read Kikkimax's "Defect" (http://www.fanfiction.net/s/3849310/1/Defect) and its sequel "Hell and Back" (http://www.fanfiction.net/s/4439954/1/Hell_and_Back)? It's an SPN/Criminal Minds crossover that has a lot of FBI!pov.

ETA: Didn't see that it was rec'd above. Sorry!

And this isn't really what you asked for, but Spoons1899's "Late Night Special" (http://spoons1899.livejournal.com/127977.html) is a kind of awesome pre-series outsider!POV fic. This features wee!chesters.