Originally Posted by Mr. James
I work in a federal building. It is posted as no weapons of any sort. The proper cite isn't the U.S. Code, but the Code of Federal Regulations, specifically, Title 41 CFR § 102-74.440:
The signs at my nearby VA hospital, and the signs at the former Social Security office (before they moved to a new location) do not cite 41 CFR 102-74.440, they cite 18 USC 930. IANAL, but I'm pretty certain if the sign cites 18 USC 930, then if you are charged with a violation you have to be charged with violating the statute of which you were given notice.