As in all businesses, Apple employees are held to the same standards of conduct within the box. A sort of internal regulation called Business Conduct, which deserves to be known.
“Business Conduct” is for Apple employees what App Store guidelines are for developers. Specifications on what is allowed to be done… and what is prohibited! Do you know for example that there is only one reference, very precise, of toilet paper that must be used in Apple Stores for employees? There is nothing exceptional about it, this kind of rule is common to all large companies.