EU and North America with CETA
"Rules of origin" cover this. Try 


Wikipedia https://en.wikipedia.org/wiki/Rules_of_origin or 
WTO: https://www.wto.org/English/tratop_e/roi_e/roi_info_e.htm  or 
EU: https://ec.europa.eu/taxation_customs/business/calculation-customs-duties/rules-origin_en or 
USA: http://2016.export.gov/FTA/nafta/eg_main_017791.asp 


Essentially the rules tell someone trading between two places with a free trade agreement in which circumstances something partly originally imported from a third country (whether under another free trade agreement or having paid an original tariff) can be freely traded under the agreement