Besides the law, there is technology to fight against counterfeiting. Radio Frequency Identification tags are brought into action to prevent false tickets at the Tennis Master Cup in Shanghai. However, necessity being the mother of invention, a new problem was that when people entered with genuine tickets, some of them tried to smuggle them out again to reuse them. But this could easily be solved by the prerequisite of visitors to hand in their tickets.
Read Laurie Sullivan's article here.