Complex sentence: If parental testing is being submitted for legal purposes in the U.S. including immigration, testing must be ordered through a lab that has AABB accreditation for Relationship DNA testing all accredited labs are listed on the AABB's website.
Split into simpler sentences: If parental testing is being submitted for legal purposes in the U.S. including immigration, testing must be ordered through a lab that has AABB accreditation for Relationship DNA testing. All accredited labs are listed on the AABB's website.