Merchandise in-transit through Canada traveling on a CBP Form 7512B (Canada 8) is exempted by regulation. What about merchandise in-transit through the United States on the same form?
Merchandise in-transit through the U.S. is treated as a Transportation and Exportation in-bond movement. This information should be transmitted to CBP via either QP/WP (one hour in advance) or CAFES (at the time of arrival). The CBP Form 7512B (Canada 8 ) may still be used at arrival but the information must be transmitted electronically.