Last month, I ran across the TSA screening all bags at Hyannis for the high speed ferry to Nantucket the day I was traveling. Usually, that vessel leaves from a slip at the other end of the parking lot from terminal building. However, for that day (or at least morning) they had the fast boat going into the slip nearest the terminal, with barricades configured to that one had to go through a TSA station where one's bags were swabbed before being allowed to pass from the building lobby out to the boarding area; this wasn't a random check, everyone was required to comply, no exceptions. They had also put up new color-coded signs at both HYA and ACK docks stating that the security level was "High" (orange).

To their credit, the Steamship Authority staff didn't seem real thrilled with the idea. When I asked the ferry staff (in a "please reassure me" tone) whether this was going to be a regular feature, I was told emphatically, "No!"

Anyway, thought I'd mention this when I finally remembered!