Abstract: A method for comparing DNA containing test results and stored results is provided, including a) a stored result selection and plurality of stored result database creation stage; b) a test result against stored result comparison stage, including: 1) A test result selection and plurality of test result database creation sub-stage; 2) A single test result database against single stored result database search sub-stage, performed for the various pairs of test result databases and stored result databases, to establish matches; 3) An established match review sub-stage, to filter out established matches which do not feature as matches across the other test result against stored result databases; 4) A process outcome sub-stage which provides details of the matches which extend across all the database pairs.