"...all newborns for a considerable time now have had their DNA sent to a central body..."
According to the information sheet given to parents by the Newborn Screening Program, of the Department of Clinical Biochemistry, Princess Margaret Hospital for Children in Western Australia: "The newborn screening laboratory is located at Princess Margaret Hospital for Children. When testing is completed, the cards are stored securely [at the hospital] for two years and then destroyed." [My clarification added.] http://www.health.wa.gov.au/docreg/Education/Prevention/Genetics/HP009372_newborn_screen_test .pdf