Good info :)

Code Adam is an in-store procedure that quickly finds lost children. If the child is not located within 10 minutes, the police are called to assist in finding the child. Thanks to Code Adam, many children have been reunited with their loved ones.

Here's how it works. The moment you discover your child is missing, alert an employee, giving information like age, name, height, hair style, clothing, and most importantly, the shoes your child is wearing. Kidnappers are less likely to be able to change your child's shoes to disguise your child. Once that employee pages a Code Adam, all employees drop what they're doing to search for the missing child. All external doors are guarded, and every child that matches the description is approached to determine if the child is yours. If your child is found, accompanied by another adult, reasonable efforts to delay their departure are taken without putting the child, staff, or visitors at risk while law enforcement is notified of the situation including a detailed description of the adult.

Not all stores support Code Adam. Upon entering a store, check the front door/window for a blue sticker that says Code Adam (a picture of the sticker can be found at the above linked article).