[Tim posted his article on identity, etc. to cypherpunks and nym; the discussion I'm replying to is primarily on cypherpunks.]
There's an important distinction between a requirement that you identify yourself accurately, and a requirement that you carry a particular form of identification.
A third category of requirement is displaying the particular form of identification if you're carrying it - for instance, if you're driving, and carrying a driver's license, you're obligated to display it, but if you're walking or a passenger, you're not generally required to, but some states (in particular California) require that if you're carrying a driver's license you're obligated to show it to any cop who asks. I don't know if the requirements include handing it over or just displaying.
It is constitutional for the police to ask you what your name is, under certain circumstances - and you can face criminal charges if you lie.
But lying and refusing to cooperate are different; "You can call me John Doe if you'd like" is not a lie, and Supreme Court cases like Brown vs. Texas have determined that you don't have to tell the police who you are even if they're booking you. On the other hand, the Supremes let police hold you for up to 48 hours for no particularly good reason (they have a more formal definition than that :-) so exercising your rights may have a cost. Tim brings up the issue of identity papers for jury duty - even if you feel like confusing the poor court bureaucrats by not bringing the PhotoID with SSN, Thumbprint, and DNA sample, there's probably a requirement to bring the jury duty summons. (Depending on your motives, your FIJA membership card is a good backup ID, or your ACLU card if you've got one - don't leave home without it.) Thanks! Bill Bill Stewart, bill.stewart@pobox.com PGP Fingerprint D454 E202 CBC8 40BF 3C85 B884 0ABE 4639