text: The fraudulent practice of passing-back a ticket can be overcome by making the ticket in the form of a tamper-proof wristband.
  When paying online for admission one may get a code, or a ticket that can be printed out, or shown on one's mobile device to be scanned or verified by the ticket taker. At the premises, it is made sure that the same right of admission is not used by other parties.
  Internet ticket fraud has become widespread, with authentic-looking but fake ticket websites taking customers' money but not delivering the tickets, notably for the 2008 Beijing Olympic Games (through websites not based in China).
  Virtual queueing
  Free tickets are applied in virtual queueing. In a place where one has to wait one's turn, there may be the system that one takes a ticket with a number from a dispenser. This system is usually found in hospitals and surgeries, and at offices where many people visit, like town halls, social security offices, labor exchanges, or post offices.
  Another form of virtual queuing is where the ticket carries a time-slot on it, rather than just a sequentially incremented number. This type of ticket would allow someone to do other things and then return for a roller-coaster ride, for example, without having to actually stand and wait in line.