Patent ID: 8002180

Claim:
A portal device associated with a controlled space comprising: a computing device having a user database that includes information associated with inventory, the inventory including at least one item, the computing device being configured to: assign an item value to each item in the inventory, calculate the item value based on a purchase price of the item, determine whether the item has been taken into the controlled space by a user in response to determining that the item has been taken into the controlled space, credit an item value of the item against a total value of the inventory that the user has taken out of the controlled space, determine whether the item has been taken out of the controlled space the user, in response to determining that the item has been taken out of the controlled space, add the item value of the item to a total value of the inventory that the user has taken out of the controlled space, and compare the total value of the inventory that the user has taken out of the controlled space with a threshold value.