[HenryArmitage]

unless the Revenue Agent can demonstrate a “REASONABLE SUSPICION” that a crime has been committed, you DO NOT have to produce Identification EVER.

I feel the need to recommend here that friends should check their state laws and if their state does have 'Stop and Identify' laws that they should become familiar with them.

[eyeamok]

Unfortunately this comes from the Supreme Court and applies to All 57 States:
http://en.wikipedia.org/wiki/Reasonable_suspicion.

Never Talk to Revenue Agents disguised as Law Enforcement Officers.