On February 11, 2021, in Cargo Systems Messaging Service (CSMS) #46187634, the U.S. Department of Agriculture (USDA) clarified the import inspection requirements for loads of potatoes, onions, and open field/field grown tomatoes exported from Canada that have been previously inspected by the Canadian Food Inspection Agency or an authorized Canadian Partners in Quality establishment. These loads can be certified meeting inspection requirements under Section 8e of the Agricultural Marketing Agreement Act of 1937, but certification must be completed prior to entering the U.S. commerce.
CSMS #46187634 can be found here:
https://content.govdelivery.com/bulletins/gd/USDHSCBP-2c0c472?wgt_ref=USDHSCBP_WIDGET_2
Details on Section 8e requirements can be found here: