If my group bothered to check, yeah, they'd have had a chance. But, well, I have no idea why they never do. Even Pink Mohawks have more of a mindset to at least check for people following you.
Guess it was just a bad game for the group. Or I was just a bad GM. Not sure which.
But, yeah. There's cameras and sensors everywhere, along with Matrix 2.0 that, if you get a signal, it's reading you. On the bright side is data overload. Trying to sort through all that much information is going to take exceptional processing power. Yeah, Shadowrun Computers are powerful, but every clocktick costs time.
So, if you snatch a purse from Jane Q. Wageslave, the cameras in the area will look for the thief's biometrics that they got from the initial snatch for... Oh... Ten seconds before it's no longer worth the time to bother, they'd be working at a loss.
Blow up something, you're worth far more. We're talking minutes, maybe even an hour.
Kill a cop, and the badges say "Screw the suits" and don't stop looking for you. Ever. Even if the accountants pitch a fit, well, they'll cite the PR profits.
Vice has a good write-up about this.