here's what one site has to say about it
http://www.wakesurfinghotline.com/ Notice Section B.2
Please note this is not a law as of right now. This is an Act that the NASBLA is pushing onto each state to pass as a State Law.
General: This Act shall apply on all waters within the jurisdiction of this state.
Section A. (Definitions.) As used in this Act:
1. "Operate" means to navigate or otherwise use a motorboat with engine(s) running.
2. "Motorboat" means any vessel not more than 65 feet in length propelled by machinery whether or not such machinery is the principal source of propulsion.
3. "Tow Rope" means a rope that connects the water-skier or wakeboarder to a motorboat. Also known as "tow line."
Section B. (Regulations for safe towing practices.)
1. No person shall operate a motorboat with a person sitting, riding, or hanging onto a swim platform or swim ladder attached to the motorboat.
2. No person shall operate a motorboat, using a tow rope of 20 feet or less, when towing a person on waterskis or other devices.
Section C. (Penalties)
Any person who violates any provision of this Act shall States may insert consistent with individual State laws/policies.
The NASBLA is the National Association of State Boating Law Administrators. The association represents the boating authorities of all 50 states and the U.S. territories.