Has the issue concerning Pentagon and Arlington Cemetery Metro stops been clarified yet? Or am I just behind on current policy?
No change - current policy of military authorites is that any gun carry is unlawful if you get out of the Metro station, even on a peaceable journey.
Current policy of the Metro Board is they don't care about their riders and will not even ask military authorities to consider a peaceable journey rule.
The good news though is that I don't think any person waives their Fourth Amendment right to be free from unreasonable search while walking from the Metro to, say, other public transportation or Macy's Dept Store at these locations.
Under the Fourth Amendment, before federal law enforcement may even briefly detain a person, they must have a reasonable articulable suspicionthat criminal activity is afoot. Terry v. Ohio
. And before a person so detained can then be lightly patted down for weapons, the officer must have reason to believe that the eprson is armed. Id.
Sometimes concealed is the best option on the Metro going thru these locations, especially in an emergency which requires Metro riders to disembark at go above ground at those locations.