598.406—Provision of services.
        
        (a) 
         The prohibitions contained in  § 598.203 apply to services performed by U.S. persons, wherever located:
    
    
    
    
        
        (b) 
         Example: U.S. persons may not, except as authorized by or pursuant to this part, provide legal, accounting, financial, brokering, freight forwarding, transportation, public relations, or other services to a specially designated narcotics trafficker. See  § 598.507 on licensing policy with regard to the provision of certain legal services.