There has been much discussion regarding the legality of driving or parking in the post office parking lit while in possession of your legal firearm. Most believed it was not enforceable but didn't want to be the first test case taken to court (and I totally understand this).
Now, a federal judge has ruled that USPS' broad interpretation violates the 2nd Amendment. This is really good news. No more gray area of legaluty just to mail a letter.