Policy Memorandum: Validity of Puerto Rico Birth Certificates as Evidence (AFM Update AD10-43) [open pdf - 133KB]
"This Policy Memorandum (PM) provides guidance to U.S. Citizenship and Immigration Services (USCIS) field offices and service centers regarding processing of petitions and applications dependent upon a Puerto Rico birth certificate to establish status, familial relationship, or other eligibility factor, in light of recent Puerto Rico legislation affecting the validity of these birth certificates."
Policy Memorandum: PM-602-0007
U.S. Citizenship and Immigration Services: http://www.uscis.gov/