In 2001, puerto rico enacted a law that requires specific labels on cement sold in puerto rico and imposes fines for any violations of these requirements. the law prohibits the sale or distribution of cement manufactured outside puerto rico that does not carry a required label warning that the cement may not be used in government-financed construction projects. antilles cement corp., a puerto rican firm that imports foreign cement, filed a complaint in federal court, claiming that this law violated the dormant commerce clause. (the dormant commerce clause doctrine applies not only to commerce among the states and u. s. territories, but also to international commerce.) did the 2001 puerto rican law violate the dormant commerce clause