36 C.F.R. § 504.12
Items to be checked
Umbrellas, canes (not needed to assist in walking), or other objects capable of inflicting damage to property or exhibits may be required to be checked in buildings where checking facilities are provided.
Umbrellas, canes (not needed to assist in walking), or other objects capable of inflicting damage to property or exhibits may be required to be checked in buildings where checking facilities are provided.