They at least see it near the time of travel. See https://www.cbp.gov/sites/default/files/documents/apis_factsheet_3.pdf https://www.cbp.gov/sites/default/files

They at least see it near the time of travel. See https://www.cbp.gov/sites/default/files/documents/apis_factsheet_3.pdf https://www.cbp.gov/sites/default/files/documents/apis_facts...