SIN and the Law, What is your commlink saying behind your back ...? Options

[Aerospider]

One aspect of SR4 that I've been struggling with for months is how identification works, particularly with regard to law enforcement.

1) When in an area that demands the broadcasting of your SIN, does everyone in range get to see it? What about your access ID? Could a hacker simply spot an executive on the other side of the street and immediately be able to spoof the guy's life to hell and back?

2) How much information can a cop/security team get on you from your SIN (assuming you don't have a criminal record)? Address? Biometrics?

3) You've been a smart boy and have had several fake SINs created, each for a different purpose and at least one being the respectable homeowning wageslave disguise you need just to get through life. Then you slip up and the cops find your prints somewhere they shouldn't be and they run a check. Do they rumble ALL your IDs? If so, then as far as I can see the only way to safeguard each ID would be to not repeat any biometric data: one ID gets your fingerprints, one gets your mugshot, one gets your DNA profile, etc. Does that sound right?

I could probably go on for pages, but hopefully answers to these questions will make other niggling issues easier to get my head around.