what i ment about the id is its with you, the way you discribed it would make it just the same as if the names were still in place. you couldnt change the number. one thing about real life is now adays things can be changed from some minor scars to getting plastic surgery, if you were born eventualy in time your whole face would change. its just difficult, right now witht he current system you can name people, but they dont keep the same name thru out the whole cantr world, i know one of my characters goes by 3 different names, making it harder for anyone to actualy pinpoint him as he could be a good guy in one town and killer in the next. but only people who have seen him have remeber him as the person who attacked or was the good guy.
i like the current system right now its actualy pretty cool. one thing that could add to description would be hair, and eye color. eyes you couldnt change unless you wore contacts but thats not currently possible in cantr. hair could be grown even possibly adding differet minerals could change the color. things like that would be alot harder to be able to figure out as they would change constantly. even a hair cut or a shaving
ok ok, ive ranted enough

as for the cop thing i only have one quote "i bust criminals!! its what i do! *sob sob*
"I think I am wearing a raccoon instead of a fur loin cloth!" O_O poor raccoon....