25 C.F.R. § 141.21
Trade confined to premises
The licensee shall confine all trade on the reservation to the premises specified in the license, except, where permitted under § 141.14, the buying and selling of livestock and livestock products.
The licensee shall confine all trade on the reservation to the premises specified in the license, except, where permitted under § 141.14, the buying and selling of livestock and livestock products.