I'm no lawyer, don't even pretend to play one on t.v.
But...
TexanCzexican noted that some states have laws that require "citizens to disclose their identity to police when officers have reasonable suspicion to believe criminal activity may be taking place."
Correct me if I'm wrong, but even if you did do something against the law on your bike, aren't those CIVIL infractions, and not CRIMINAL?
Running a red light on your bike = civil
Using your bike to purse snatch = criminal.
Yes??
Regardless....I carry my ID only because I want someone to be able to identify my body if I should buy the farm on a ride. And I carry my insurance card so they'll have what they need if I survive and end up in a hospital. Warped, perhaps, but ....c'est la vie.
2007 Seven ID8 - Bontrager InForm
2003 Klein Palomino - Terry Firefly (?)
2010 Seven Cafe Racer - Bontrager InForm
2008 Cervelo P2C - Adamo Prologue Saddle