Why and how is build evidence established?

Evidence that a vessel was built in the U.S. is required for a vessel which is to be used in the fisheries or coastwise trade. Build evidence is normally established by submitting a Builder’s Certification. That form must be completed by the person who constructed or oversaw the construction of the vessel or an official of the company that built the vessel who has examined the records of the company to determine the facts of build. The Original Builder’s Certification or Facts of Build Letter must be presented with your submission. A copy will NOT be accepted.
why and how is build evidence established