Roadrunner:
The poster we are all familiar with is:
http://new.usps.com/cpim/ftp/posters/pos158.pdf
However, please note the first line: Except as provided in subsection (d)
They then ignore to list subsection (d)
Here it is:
http://uscode.house.gov/DOWNLOAD/18C44.DOC
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(d) Subsection (a) shall not apply to -
(1) the lawful performance of official duties by an officer, agent, or employee of the United States, a State, or a political subdivision thereof, who is authorized by law to engage in or supervise the prevention, detection, investigation, or prosecution of any violation of law;
(2) the possession of a firearm or other dangerous weapon by a Federal official or a member of the Armed Forces if such possession is authorized by law; or (3) the lawful carrying of firearms or other dangerous weapons in a Federal facility incident to hunting or other lawful purposes.
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Subsection (d), part (3) should apply to legal CCW. "or other lawful purposes".
Attorney Robert P. Firriolo has gone over this many times on rec.guns.
As always, be careful, and if in doubt don't carry. If you carry properly, they will never know. State laws do vary.
Eric
[This message has been edited by Eric Blair (edited October 06, 2000).]