Does Dulles have secure wrapping service at Dulles airport?
Do they have to check first before wrapping my luagage
As stated before, there is no luggage wrapping service at Dulles.
You can wrap your own luggage if you want before you get to the airport, but if TSA decides they want to inspect your bag, they will cut the plastic wrap and not replace it. You cannot have your bag checked before you wrap it as the TSA checks are done after you give your bag to the airline.