well, i know that, in bones, sweets' charakter is the fbi-psychologist. he's not even meant to work on cases or anything, he's just there as a psychologist for the agents. but i think it was booth' idea to bring sweets in on some cases to use his psychological training for profiling or interviewing suspects. so technically, sweets is just a psychologist, not a profiler so to speak. but one works pretty well with the other.