Every cell in the body contains the same DNA, therefore we can use any cell type that comes from the human body.

Most people believe that hair can be used as a source of DNA for a paternity test. This answer is yes and no. If the hair has been pulled out the roots or follicles will be attached, we can extract DNA from the roots and use it to determine paternity.

If the hair is found on a brush, comb or pillow it will not contain DNA. This is due to the life cycle of hair. As the hair ages and prepares to fall out, the nucleus and DNA contents are degraded. This will make hair unusable for paternity testing.