Well, for existing cars, keep your key in a faraday cage. My friend (who's not particularly technical and probably didn't know what a faraday cage was previous

Well, for existing cars, keep your key in a faraday cage. My friend (who's not particularly technical and probably didn't know what a faraday cage was previously) told me that's what we has doing with his Prius key after it had been broken into with no sign of forced entry twice.