31 CFR 536.406 - Provision of services.
(a) Except as provided in § 536.205, the prohibitions contained in § 536.201 apply to services performed by U.S. persons, wherever located:
(1) On behalf of, or for the benefit of, a specially designated narcotics trafficker; or
(b) Example: U.S. persons may not, except as authorized by the Office of Foreign Assets Control by or pursuant to this part, provide legal, accounting, financial, brokering, freight forwarding, transportation, public relations, educational, or other services to a specially designated narcotics trafficker. See § 536.506, with respect to certain authorized legal services.