Planning to travel this holiday season? In 2005, CBC News announced that fruitcake is a security threat. In fact, they said if you try to bring a fruitcake onboard an airplane, expect it to be X-rayed because they are dense and could hide a weapon. This restriction is still in effect today. No kidding? I’ve always believed that the fruitcake itself was the weapon. In fact, you could kill someone with a fruitcake, easy.