RULES DNA EVIDENCE:

     DNA is an organic substance found in a person’s cells which contains his or her genetic code.  Except for identical twins, each person’s DNA profile is distinct and unique. The purpose of DNA testing is to ascertain whether an association exists between the evidence sample and the reference sample. In assessing the probative value of DNA evidence, therefore, courts should consider, among others things, the following data:  a) How the samples were collected; b) How they were handled; c) The possibility of contamination of the samples; d) The procedure followed in analyzing the samples; e) Whether the proper standards and procedures were followed in conducting the tests; and f) The qualification of the analyst who conducted the tests.  (People vs. Vallejo, G.R. No. 144656.  May 9, 2002, Per Curiam).