On July 1, 2010, the Vital Statistics Office of the Commonwealth of Puerto Rico began issuing new, more secure certified copies of birth certificates to U.S. citizens born in Puerto Rico because of a new Puerto Rico birth certificate law. After October 30, 2010, all certified copies of Puerto Rico birth certificates issued before July 1, 2010, will become invalid. However, U.S. Citizenship and Immigration Services (USCIS) noted in recent guidance that employers may continue to accept Puerto Rico birth certificates issued before July 1, 2010, as valid list C documents through October 30, 2010. Beginning October 31, 2010, employers may accept Puerto Rico birth certificates issued after July 1, 2010.
The USCIS announcement, released on September 30, 2010, is available here.