UNKNOWN
Well, I mean you wouldn't put a white face say on a black skull and vice versa, I mean that would be ridiculous, but the point is, if you have broad racial groups and you use a data bank which reflects that, that is fine if you are using it as a guide.  If you are obviously going to take it much further than that, and I am talking here of police work and using publicity to try and get somebody recognised, etc, then obviously you have to use different criteria, and then we would go into identikit images and so on, so it becomes more complicated.