In the absence of any DNA legislation in the Philippines, the use of DNA evidence in the country is currently governed by the Rule on DNA Evidence which was promulgated by the Philippine Supreme Court on October 15, 2007. The full text of A.M. No. 06-11-5-SC can be found here

SEC. 7. Assessment of probative value of DNA evidence. — In assessing the probative value of the DNA evidence presented, the court shall consider the following:

(a) The chain of custody, including how the biological samples were collected, how they were handled, and the possibility of contamination of the samples; (b) The DNA testing methodology, including the procedure followed in analyzing the samples, the advantages and disadvantages of the procedure, and compliance with the scientifically valid standards in conducting the tests; (c) The forensic DNA laboratory, including accreditation by any reputable standards-setting institution and the qualification of the analyst who conducted the tests. If the laboratory is not accredited, the relevant experience of the laboratory in forensic casework and credibility shall be properly established; and (d) The reliability of the testing result, as hereinafter provided.

The provisions of the Rules of Court concerning the appreciation of evidence shall apply suppletorily.