video; DF filter
[Amused look here: ohgosh Marina, you really do know how to provide unusual acquaintances. ]
You can get pretty far with common sense. Actually, that's one of the major points people bring up when they question the nature of criminal profiling - that it's only based on common sense and as such it can't be seen as a reliable method in law enforcement. There's a lot more to it though, and putting together the initial profile is only one step of many towards catching the UnSub.