Search boxes are located in each hutch and play an important role in searching procedures. Each box is labeled with a number, and has two buttons (yellow and green). Normally, the buttons are not lit, with the exception of the yellow light on Search Box 1. This yellow light will be flashing.

A search of the hutch commences when the green button on Search Box 1 is pressed. Before doing so, however, the area around the Search Box must be thoroughly searched and secured to ensure that all persons have exited. Once the area is clear and the green button is pressed, the yellow button will become solid yellow, and an alarm will sound instructing all other people in the hutch to exit.

The person securing the hutch should then proceed to Search Box 2 (if there is one). At this point, the yellow light of Search Box 2 will be flashing. The search and secure process performed at Search Box 1 must be performed again to ensure that all persons have exited the area of the hutch around Search Box 2. If the area is secure, the green button on Search Box 2 should be pressed. If there is a third search box, the person securing the hutch should then proceed to it and repeat the same process again. Once the entire hutch has been searched, the door can be closed.