Flags At Half Staff?

Driving through town today I noticed that the U.S. Flag at the Court House was lowered to half staff yet the U.S. Flag at the Federal Post Office was not lowered to half staff. This is troubling as there were also several U.S. Flags posted around the courthouse improperly.

If the U.S. Flag is ordered by either the president or governor, the only two authorized to issue such an order, then why wasn't the flag at the Post Office Building also at half staff and why wasn't the flags around the courthouse posted properly?

If an appropriate order is issued to lower the U.S. Flag to half staff all U.S. Flags on government property are required to be flown at half staff. For those not able, because of size, or having been fixed to the staff, to be lowered to half staff a black ribbon may be attached at the top of that staff.

While we rightly remember this Patriot's Day with respect and prayers, we should also follow proper flag protocol in doing so.