The document I have (last updated May 1st 2018) states:
Costco has a "No Bare Hands" policy- i.e. gloves must be used where there is direct hand contact with ready-to-eat products (all risk level). The facility must have a written procedure for the proper handling and usage of gloves and must include verification documentation. Reusable rubber gloves must be washed and sanitized frequently, after breaks, and/or after handling potential contaminants. If fabric gloves are used when hands are are in contact with food, they need to be covered with an outer non latex, powder free disposable glove. All other types of gloves are to be latex free and powder free. They should always be clean and in good condition.
Where it can be demonstrated, through scientifically sound validation studies, that the wearing of gloves is impractical or less hygienic than bare hands, Costco may grant an exception to the glove requirement.. There are rarely issued, and are only granted when the product, processes, risk-level, and validation evidence support this.