A system and method for controlling fraud in presentations, sales and transactions using electronic devices to collect biometric data or other identification from a person seeking access to a property or wishing to participate in a transaction. The device (Figure 1 , Security Part) located on the property can communicate with a remote computer (Figure 1 , Comput Part) that decides whether to allow or deny access. Persons seeking access can be categorized, and different access procedures can be used based on the person' s category. The system can track and record all accesses, egresses, offers and counter-offers made on the property or transaction from when it is started until it is concluded. The device will also be portable for transaction other than real estate specific.