many companies use sophisticated technologies to monitor their customers and employees in order to keep their inventory from walking off. examples, include closed-circuit video cameras and radio frequency identification (RFID). other companies use techniques that don't reply on technology, such as taking frequent inventory counts. having employees keep all personal belongings and bags in a separate changing room, and making surprise check's of employees' bags as they leave. An increasing numbers of companies are setting up toll-free phone numbers that employees or customers can call or report suspicious behavior, sometime for a reward.