Sad, but true--Va Code Section 46.2--1079. Cops can and do take it "until no longer needed". When you cross the state line, there are signs saying radar detectors are illegal.
You also must have a front plate in Va (but not NC) I suspect if the state you come from requires no front plate you are fine. Cock fighting , however is now banned. (so is dog fighting as Vick found out here in his home state) We are coming along but things take time here in the Commonwealth.
Oh, and the liquor stores are state run (same in NC), so no buying a fifth at the conveniance store and no buying hard liquor on Sunday. Are we starting to sound like "Mayberry"? If you run into a problem I know some good lawyers (like the 950 in my firm)