An advance ruling is a written document received from the customs authority from a NAFTA country. It provides binding information on specific NAFTA questions you may have about future imports of goods into Canada, Mexico and the United States.
NAFTA Marking Rulings Issued by U.S. Customs and Border Protection
Chapter 11 - Advance Ruling Procedures
19 CFR 181.91-.102 - Advance Ruling Procedures can be found in section 181.91 - 181.102.
Advance Rulings: A Complete Review
Customs Rulings Online Search System (CROSS) - Turn on NAFTA filter