“he ‘cased’ disney? what makes them say that? what was he doing differently from any of the other thousands of visitors that day that made him stand out? funny no explanaation” Haven't you ever looked at someone and thought "undercover cop"? Do you know a cute girl (or guy) who gets looked at by dozens of people a day but occasionally notices one in particular as creepy? It's actually pretty easy to spot the people who are not there for the same reason as the rest of the crowd.
Yes, they are Secret Service
not quite a normal expression
I once sat next to a guy on a flight from London to Chicago.
We chatted and after a while I knew something was up.
As we were landing I said “I bet I know what you do for a living.” He just smiled and asked “What?”
I speculated that he works for the government and flies, a lot.
He flashed a subtle grin.
After the seatbelt sign turned of we wished each other well, and when we shook hands he passed me an Air Marshal pin.