At the risk of responding obliquely to your question, I'll say this:
Recruiters are painfully aware that they can't recruit every player that they see that they like; usually because they've already filled their own need for players at that position with those characteristics or they're aware that the player is predisposed to go another direction. Meanwhile, most of them are relative contemporaries and they know one another; and there's a certain amount of fraternal bond that exists among them.
This sometimes causes them to talk among themselves about various players they see; making it fairly frequently the case that a recruiter wearing a certain school's gear ends up serving as a proxy for another. In extreme cases, a recruiter from School A, knowing that he won't be able to see a certain upcoming event will call his former teammate and long-time friend at School B and ask him to watch and evaluate a player at the event in whom he has interest. It is in part because of this that you sometimes read here that you never know who's watching.
Countering all of this is the awareness that some of them are head-to-head competitors; a consideration that tends to trump legacy relationships. The combination of all of this forces recruiters to maintain an informed, street-savvy sense to their communications with their peers and makes it virtually impossible for players and their parents to know a recruiter's actual intent and level of interest when they see them at an event.