36 C.F.R. § 1002.37
Noncommercial soliciting
Soliciting or demanding gifts, money, goods or services is prohibited, except pursuant to the terms and conditions of a permit that has been issued under § 1002.50, § 1002.51 or § 1002.52.
Soliciting or demanding gifts, money, goods or services is prohibited, except pursuant to the terms and conditions of a permit that has been issued under § 1002.50, § 1002.51 or § 1002.52.