DNA testing is done for the recognition of individuals by their personal DNA profiles. A buccal swab is used in the DNA process. It helps to decrease the probability of contamination. If not available, other ways may be employed such as gathering saliva or blood sample. If you want to know your DNA profile, you may go to DNACenter.com for paternity test. More than 1,000,000 have tried this and the precision is 100% guaranteed.